diff --git a/core/net/ipv6/sicslowpan.c b/core/net/ipv6/sicslowpan.c
index 3b722d598fc2a3201fa9986e6d9f20a4e7963d90..de9d78181e3de1cda2f2c002f84cf91ccc07559b 100644
--- a/core/net/ipv6/sicslowpan.c
+++ b/core/net/ipv6/sicslowpan.c
@@ -1757,8 +1757,8 @@ sicslowpan_init(void)
 #ifdef SICSLOWPAN_CONF_ADDR_CONTEXT_0
   SICSLOWPAN_CONF_ADDR_CONTEXT_0;
 #else
-  addr_contexts[0].prefix[0] = 0xaa;
-  addr_contexts[0].prefix[1] = 0xaa;
+  addr_contexts[0].prefix[0] = UIP_DS6_DEFAULT_PREFIX_0;
+  addr_contexts[0].prefix[1] = UIP_DS6_DEFAULT_PREFIX_1;
 #endif
 #endif /* SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS > 0 */
 
diff --git a/core/net/ipv6/uip-ds6.h b/core/net/ipv6/uip-ds6.h
index 1c00a50b056818aae10629e2f456ec0867b3669b..294eb230c944515fe86f172aa5a2abdc5ee41256 100644
--- a/core/net/ipv6/uip-ds6.h
+++ b/core/net/ipv6/uip-ds6.h
@@ -67,6 +67,36 @@
 #endif
 #define UIP_DS6_DEFRT_NB UIP_DS6_DEFRT_NBS + UIP_DS6_DEFRT_NBU
 
+/* Default prefix */
+#ifdef UIP_CONF_DS6_DEFAULT_PREFIX
+#define UIP_DS6_DEFAULT_PREFIX UIP_CONF_DS6_DEFAULT_PREFIX
+#else
+/* From RFC4193, section 3.1:
+ *  | 7 bits |1|  40 bits   |  16 bits  |          64 bits           |
+ *  +--------+-+------------+-----------+----------------------------+
+ *  | Prefix |L| Global ID  | Subnet ID |        Interface ID        |
+ *  +--------+-+------------+-----------+----------------------------+
+ *     Prefix            FC00::/7 prefix to identify Local IPv6 unicast
+ *                       addresses.
+ *     L                 Set to 1 if the prefix is locally assigned.
+ *                       Set to 0 may be defined in the future.  See
+ *                       Section 3.2 for additional information.
+ *     Global ID         40-bit global identifier used to create a
+ *                       globally unique prefix.  See Section 3.2 for
+ *                       additional information.
+ *
+ * We set prefix to 0xfc00 and set the local bit, resulting in 0xfd00.
+ * For high probability of network uniqueness, Global ID must be generated
+ * pseudo-randomly. As this is a hard-coded default prefix, we simply use
+ * a Global ID of 0. For real deployments, make sure to install a pseudo-random
+ * Global ID, e.g. in a RPL network, by configuring it at the root.
+ */
+#define UIP_DS6_DEFAULT_PREFIX 0xfd00
+#endif /* UIP_CONF_DS6_DEFAULT_PREFIX */
+
+#define UIP_DS6_DEFAULT_PREFIX_0 ((UIP_DS6_DEFAULT_PREFIX >> 8) & 0xff)
+#define UIP_DS6_DEFAULT_PREFIX_1 (UIP_DS6_DEFAULT_PREFIX & 0xff)
+
 /* Prefix list */
 #define UIP_DS6_PREFIX_NBS  1
 #ifndef UIP_CONF_DS6_PREFIX_NBU
diff --git a/core/net/rpl/rpl-dag-root.c b/core/net/rpl/rpl-dag-root.c
index efbdb40353dbf8e56833ff9367ad4c920f4d8dc0..d053a1a132412afcd341c84b8426d1ef45729bcf 100644
--- a/core/net/rpl/rpl-dag-root.c
+++ b/core/net/rpl/rpl-dag-root.c
@@ -146,7 +146,7 @@ set_global_address(void)
 
   /* Assign a unique local address (RFC4193,
      http://tools.ietf.org/html/rfc4193). */
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -213,7 +213,7 @@ rpl_dag_root_init_dag_immediately(void)
         dag->instance->def_route = NULL;
       }
 
-      uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+      uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
       rpl_set_prefix(dag, &prefix, 64);
       PRINTF("rpl_dag_root_init_dag: created a new RPL dag\n");
       return 0;
diff --git a/cpu/native/net/wpcap.c b/cpu/native/net/wpcap.c
index f32ba980f7ee3867f3024a6fc96b2376513299bd..301b07d91eaad584c596b2c5cdaeea1890a18d57 100644
--- a/cpu/native/net/wpcap.c
+++ b/cpu/native/net/wpcap.c
@@ -525,7 +525,7 @@ wpcap_init(void)
 //	  }
 #else
       addr.s_addr = inet_addr("10.10.10.10");   //prefer ipv4 default for legacy compatibility
-//    uiplib_ipaddrconv("aaaa::1",(uip_ipaddr_t*) &addr6.s6_addr);
+//    uiplib_ipaddrconv("fd00::1",(uip_ipaddr_t*) &addr6.s6_addr);
 #endif
 
 #ifdef UIP_FALLBACK_INTERFACE
diff --git a/examples/cc2530dk/border-router/README.md b/examples/cc2530dk/border-router/README.md
index ebb9545a203a776c3f7633352f6c6d85d8fe4976..8c5025c4d568aff34211b7d623955b3d0115a0f5 100644
--- a/examples/cc2530dk/border-router/README.md
+++ b/examples/cc2530dk/border-router/README.md
@@ -15,6 +15,6 @@ The node will use this address to obtain the network prefix
 
 For example:
 
-    sudo ./tunslip6 aaaa::1/64
+    sudo ./tunslip6 fd00::1/64
 
-This will use aaaa:: / 64 as the prefix for the 15.4 network.
+This will use fd00:: / 64 as the prefix for the 15.4 network.
diff --git a/examples/cc2530dk/udp-ipv6/client.c b/examples/cc2530dk/udp-ipv6/client.c
index 77d50b0df5c4a86e14049e1b1581d5bf04787fb7..065c070893917783bfbbd7b29fb420f4a3e5629c 100644
--- a/examples/cc2530dk/udp-ipv6/client.c
+++ b/examples/cc2530dk/udp-ipv6/client.c
@@ -130,7 +130,7 @@ PROCESS_THREAD(udp_client_process, ev, data)
   PRINTF(" local/remote port %u/%u\n",
          UIP_HTONS(l_conn->lport), UIP_HTONS(l_conn->rport));
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0x0215, 0x2000, 0x0002, 0x2145);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0x0215, 0x2000, 0x0002, 0x2145);
   g_conn = udp_new(&ipaddr, UIP_HTONS(3000), NULL);
   if(!g_conn) {
     PRINTF("udp_new g_conn error.\n");
diff --git a/examples/cc2530dk/udp-ipv6/ping6.c b/examples/cc2530dk/udp-ipv6/ping6.c
index e19a368955937281bf33082608ee9016277d289d..3f6fce89bcade6bcd0ba592c9bc36fe2f6d24546 100644
--- a/examples/cc2530dk/udp-ipv6/ping6.c
+++ b/examples/cc2530dk/udp-ipv6/ping6.c
@@ -105,7 +105,7 @@ PROCESS_THREAD(ping6_process, ev, data)
   PRINTF("ping6 running.\n");
   PRINTF("Button 1: 5 pings 16 byte payload.\n");
 
-  uip_ip6addr(&dest_addr, 0xaaaa, 0, 0, 0, 0x0215, 0x2000, 0x0002, 0x2145);
+  uip_ip6addr(&dest_addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0x0215, 0x2000, 0x0002, 0x2145);
   count = 0;
 
   icmp6_new(NULL);
diff --git a/examples/cc2530dk/udp-ipv6/server.c b/examples/cc2530dk/udp-ipv6/server.c
index 0b61194aa11e662f3c86665ce0e9ee41b0ed0e85..ab381ccf5a6a7a409f9c7e82be0bb6ca722f1925 100644
--- a/examples/cc2530dk/udp-ipv6/server.c
+++ b/examples/cc2530dk/udp-ipv6/server.c
@@ -126,7 +126,7 @@ create_dag()
 {
   rpl_dag_t *dag;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -135,7 +135,7 @@ create_dag()
   dag = rpl_set_root(RPL_DEFAULT_INSTANCE,
                      &uip_ds6_get_global(ADDR_PREFERRED)->ipaddr);
   if(dag != NULL) {
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_set_prefix(dag, &ipaddr, 64);
     PRINTF("Created a new RPL dag with ID: ");
     PRINT6ADDR(&dag->dag_id);
diff --git a/examples/cc2538-common/mqtt-demo/project-conf.h b/examples/cc2538-common/mqtt-demo/project-conf.h
index 0aaef655dc8021011556178b3781de54b52e2b7b..bcdabff20b48a1755e3c110664a88794ba376b02 100644
--- a/examples/cc2538-common/mqtt-demo/project-conf.h
+++ b/examples/cc2538-common/mqtt-demo/project-conf.h
@@ -45,7 +45,7 @@
 #define MQTT_DEMO_PUBLISH_TRIGGER &button_right_sensor
 
 /* If undefined, the demo will attempt to connect to IBM's quickstart */
-#define MQTT_DEMO_BROKER_IP_ADDR "aaaa::1"
+#define MQTT_DEMO_BROKER_IP_ADDR "fd00::1"
 /*---------------------------------------------------------------------------*/
 #endif /* PROJECT_CONF_H_ */
 /*---------------------------------------------------------------------------*/
diff --git a/examples/er-rest-example/Makefile b/examples/er-rest-example/Makefile
index a20d814ee2ed614efb8b315748b003f6e7556947..817a83b9df8dce9c974e1438e7ddd1ebe8e0c40d 100644
--- a/examples/er-rest-example/Makefile
+++ b/examples/er-rest-example/Makefile
@@ -57,13 +57,13 @@ $(CONTIKI)/tools/tunslip6:	$(CONTIKI)/tools/tunslip6.c
 	(cd $(CONTIKI)/tools && $(MAKE) tunslip6)
 
 connect-router:	$(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 fd00::1/64
 
 connect-router-cooja:	$(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 -p 60001 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 -p 60001 fd00::1/64
 
 connect-router-native:	$(CONTIKI)/examples/ipv6/native-border-router/border-router.native
-	sudo $(CONTIKI)/exmples/ipv6/native-border-router/border-router.native -a 127.0.0.1 -p 60001 aaaa::1/64
+	sudo $(CONTIKI)/exmples/ipv6/native-border-router/border-router.native -a 127.0.0.1 -p 60001 fd00::1/64
 
 connect-minimal:
 	sudo ip address add fdfd::1/64 dev tap0 
diff --git a/examples/er-rest-example/README.md b/examples/er-rest-example/README.md
index fe82ed9b5f06ad4f2d826966bc51fb9e792627de..25abd60e4adeba20192dd99167216840bf58f7be 100644
--- a/examples/er-rest-example/README.md
+++ b/examples/er-rest-example/README.md
@@ -23,8 +23,8 @@ PRELIMINARIES
     #define NETSTACK_CONF_RDC     nullrdc_driver
 - Alternatively, you can use the native-border-router together with the slip-radio.
 - For convenience, define the Cooja addresses in /etc/hosts
-      aaaa::0212:7401:0001:0101 cooja1
-      aaaa::0212:7402:0002:0202 cooja2
+      fd00::0212:7401:0001:0101 cooja1
+      fd00::0212:7402:0002:0202 cooja2
       ...
 - Get the Copper (Cu) CoAP user-agent from
   [https://addons.mozilla.org/en-US/firefox/addon/copper-270430](https://addons.mozilla.org/en-US/firefox/addon/copper-270430)
@@ -82,11 +82,11 @@ TMOTES HOWTO
 
 3. Start Copper and discover resources at:
 
-        coap://[aaaa::____:____:____:____]:5683/
+        coap://[fd00::____:____:____:____]:5683/
 
 ### Add a client:
 
-1. Change the hard-coded server address in er-example-client.c to aaaa::____:____:____:____
+1. Change the hard-coded server address in er-example-client.c to fd00::____:____:____:____
 2. Connect a third Tmote Sky
 
         make TARGET=sky er-example-client.upload MOTE=3
diff --git a/examples/hello-world/README.md b/examples/hello-world/README.md
index c4cbd2c6e68736340a4edfa2a47a51254174df71..a92c242ab8e8c7d1d52334cbb89bde103c197c24 100644
--- a/examples/hello-world/README.md
+++ b/examples/hello-world/README.md
@@ -34,7 +34,7 @@ For example, using a loopback interface with the minimal-net platform:
     make UIP_CONF_IPV6=1 TARGET=minimal-net
     ./hello-world.minimal-net
     Hello, world
-    IPV6 Address: [aaaa::206:98ff:fe00:232]
+    IPV6 Address: [fd00::206:98ff:fe00:232]
     IPV6 Address: [fe80::206:98ff:fe00:232]
     ^C
 
diff --git a/examples/ipv6/json-ws/json-ws.c b/examples/ipv6/json-ws/json-ws.c
index 6c6177f16ea7b5f988e224786473b247cd36ecad..6a290a1949c873e3e1cf2f3d7d61aaf14b95dc49 100644
--- a/examples/ipv6/json-ws/json-ws.c
+++ b/examples/ipv6/json-ws/json-ws.c
@@ -78,7 +78,7 @@
 static const char http_content_type_json[] = "application/json";
 
 /* Maximum 40 chars in host name?: 5 x 8 */
-static char callback_host[40] = "[aaaa::1]";
+static char callback_host[40] = "[fd00::1]";
 static uint16_t callback_port = CALLBACK_PORT;
 static uint16_t callback_interval = SEND_INTERVAL;
 static char callback_path[80] = "/debug/";
diff --git a/examples/ipv6/multicast/root.c b/examples/ipv6/multicast/root.c
index 0f27e7d1769fa2cc844b5041d2cebad59ef0fdb1..cb7d2b4a6f460620904249ebd5b66aaa14bd978a 100644
--- a/examples/ipv6/multicast/root.c
+++ b/examples/ipv6/multicast/root.c
@@ -111,7 +111,7 @@ set_own_addresses(void)
   rpl_dag_t *dag;
   uip_ipaddr_t ipaddr;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
diff --git a/examples/ipv6/multicast/sink.c b/examples/ipv6/multicast/sink.c
index 4c272869a23be5a446755a9512075eb3ef1699c1..ea2ef1085fce0a9a3b821e28083f7f3bc3818b14 100644
--- a/examples/ipv6/multicast/sink.c
+++ b/examples/ipv6/multicast/sink.c
@@ -84,7 +84,7 @@ join_mcast_group(void)
   uip_ds6_maddr_t *rv;
 
   /* First, set our v6 global */
-  uip_ip6addr(&addr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&addr, &uip_lladdr);
   uip_ds6_addr_add(&addr, 0, ADDR_AUTOCONF);
 
diff --git a/examples/ipv6/native-border-router/Makefile b/examples/ipv6/native-border-router/Makefile
index d781ed35c65be67f928b75ff12e4da3127354923..dc60e18d9063b2d682a4e7783b0cc12e66e3e04a 100644
--- a/examples/ipv6/native-border-router/Makefile
+++ b/examples/ipv6/native-border-router/Makefile
@@ -24,4 +24,4 @@ CONTIKI_WITH_IPV6 = 1
 include $(CONTIKI)/Makefile.include
 
 connect-router:	border-router.native
-	sudo ./border-router.native aaaa::1/64
+	sudo ./border-router.native fd00::1/64
diff --git a/examples/ipv6/native-border-router/slip-config.c b/examples/ipv6/native-border-router/slip-config.c
index 84d256127c8e06369858cee75728f265d45348fb..782259f8c21b1a8c3bd11609bfe0a47e9a34cd73 100644
--- a/examples/ipv6/native-border-router/slip-config.c
+++ b/examples/ipv6/native-border-router/slip-config.c
@@ -125,7 +125,7 @@ slip_config_handle_arguments(int argc, char **argv)
     case 'h':
     default:
 fprintf(stderr,"usage:  %s [options] ipaddress\n", prog);
-fprintf(stderr,"example: border-router.native -L -v2 -s ttyUSB1 aaaa::1/64\n");
+fprintf(stderr,"example: border-router.native -L -v2 -s ttyUSB1 fd00::1/64\n");
 fprintf(stderr,"Options are:\n");
 #ifdef linux
 fprintf(stderr," -B baudrate    9600,19200,38400,57600,115200,921600 (default 115200)\n");
diff --git a/examples/ipv6/rpl-border-router/Makefile b/examples/ipv6/rpl-border-router/Makefile
index ce90a4eace90e5e828a197e3aa60a4bb98d670da..6595186be556faa81ffb6e0bddc2a8f1cdf55b90 100644
--- a/examples/ipv6/rpl-border-router/Makefile
+++ b/examples/ipv6/rpl-border-router/Makefile
@@ -33,7 +33,7 @@ CFLAGS += -DWEBSERVER=2
 endif
 
 ifeq ($(PREFIX),)
- PREFIX = aaaa::1/64
+ PREFIX = fd00::1/64
 endif
 
 CONTIKI_WITH_IPV6 = 1
diff --git a/examples/ipv6/rpl-collect/udp-sender.c b/examples/ipv6/rpl-collect/udp-sender.c
index dd279cc7f778d96194ecc0f470598b224e7c09ee..469d5e6f0ab831d70446e94c3b127e7bead30277 100644
--- a/examples/ipv6/rpl-collect/udp-sender.c
+++ b/examples/ipv6/rpl-collect/udp-sender.c
@@ -195,12 +195,12 @@ set_global_address(void)
 {
   uip_ipaddr_t ipaddr;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
   /* set server address */
-  uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+  uip_ip6addr(&server_ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 1);
 
 }
 /*---------------------------------------------------------------------------*/
diff --git a/examples/ipv6/rpl-collect/udp-sink.c b/examples/ipv6/rpl-collect/udp-sink.c
index dbdde2d017d4e51f65ad05160e4d7baf6f59404d..7834c7cbc526239422ffc32caeef3badd26c26ef 100644
--- a/examples/ipv6/rpl-collect/udp-sink.c
+++ b/examples/ipv6/rpl-collect/udp-sink.c
@@ -145,14 +145,14 @@ PROCESS_THREAD(udp_server_process, ev, data)
   PRINTF("UDP server started\n");
 
 #if UIP_CONF_ROUTER
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 1);
   /* uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr); */
   uip_ds6_addr_add(&ipaddr, 0, ADDR_MANUAL);
   root_if = uip_ds6_addr_lookup(&ipaddr);
   if(root_if != NULL) {
     rpl_dag_t *dag;
     dag = rpl_set_root(RPL_DEFAULT_INSTANCE,(uip_ip6addr_t *)&ipaddr);
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_set_prefix(dag, &ipaddr, 64);
     PRINTF("created a new RPL dag\n");
   } else {
diff --git a/examples/ipv6/rpl-udp/udp-client.c b/examples/ipv6/rpl-udp/udp-client.c
index c16b0ba4809e340933a8d8665bb41a2e1f731f1e..27970388010d250b47e55e2e5241e7cf77640734 100644
--- a/examples/ipv6/rpl-udp/udp-client.c
+++ b/examples/ipv6/rpl-udp/udp-client.c
@@ -116,7 +116,7 @@ set_global_address(void)
 {
   uip_ipaddr_t ipaddr;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -125,21 +125,21 @@ set_global_address(void)
  * Obviously the choice made here must also be selected in udp-server.c.
  *
  * For correct Wireshark decoding using a sniffer, add the /64 prefix to the 6LowPAN protocol preferences,
- * e.g. set Context 0 to aaaa::.  At present Wireshark copies Context/128 and then overwrites it.
- * (Setting Context 0 to aaaa::1111:2222:3333:4444 will report a 16 bit compressed address of aaaa::1111:22ff:fe33:xxxx)
+ * e.g. set Context 0 to fd00::.  At present Wireshark copies Context/128 and then overwrites it.
+ * (Setting Context 0 to fd00::1111:2222:3333:4444 will report a 16 bit compressed address of fd00::1111:22ff:fe33:xxxx)
  *
  * Note the IPCMV6 checksum verification depends on the correct uncompressed addresses.
  */
  
 #if 0
 /* Mode 1 - 64 bits inline */
-   uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+   uip_ip6addr(&server_ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 1);
 #elif 1
 /* Mode 2 - 16 bits inline */
-  uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0, 0x00ff, 0xfe00, 1);
+  uip_ip6addr(&server_ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0x00ff, 0xfe00, 1);
 #else
 /* Mode 3 - derived from server link-local (MAC) address */
-  uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0x0250, 0xc2ff, 0xfea8, 0xcd1a); //redbee-econotag
+  uip_ip6addr(&server_ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0x0250, 0xc2ff, 0xfea8, 0xcd1a); //redbee-econotag
 #endif
 }
 /*---------------------------------------------------------------------------*/
diff --git a/examples/ipv6/rpl-udp/udp-server.c b/examples/ipv6/rpl-udp/udp-server.c
index b735d3bb2ab4bce585a5610db0cf167e97ae768c..17c1b1fb8a36de65d01c369c6688ab980249185d 100644
--- a/examples/ipv6/rpl-udp/udp-server.c
+++ b/examples/ipv6/rpl-udp/udp-server.c
@@ -114,20 +114,20 @@ PROCESS_THREAD(udp_server_process, ev, data)
  * Obviously the choice made here must also be selected in udp-client.c.
  *
  * For correct Wireshark decoding using a sniffer, add the /64 prefix to the 6LowPAN protocol preferences,
- * e.g. set Context 0 to aaaa::.  At present Wireshark copies Context/128 and then overwrites it.
- * (Setting Context 0 to aaaa::1111:2222:3333:4444 will report a 16 bit compressed address of aaaa::1111:22ff:fe33:xxxx)
+ * e.g. set Context 0 to fd00::.  At present Wireshark copies Context/128 and then overwrites it.
+ * (Setting Context 0 to fd00::1111:2222:3333:4444 will report a 16 bit compressed address of fd00::1111:22ff:fe33:xxxx)
  * Note Wireshark's IPCMV6 checksum verification depends on the correct uncompressed addresses.
  */
  
 #if 0
 /* Mode 1 - 64 bits inline */
-   uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+   uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 1);
 #elif 1
 /* Mode 2 - 16 bits inline */
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0x00ff, 0xfe00, 1);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0x00ff, 0xfe00, 1);
 #else
 /* Mode 3 - derived from link local (MAC) address */
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
 #endif
 
@@ -136,7 +136,7 @@ PROCESS_THREAD(udp_server_process, ev, data)
   if(root_if != NULL) {
     rpl_dag_t *dag;
     dag = rpl_set_root(RPL_DEFAULT_INSTANCE,(uip_ip6addr_t *)&ipaddr);
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_set_prefix(dag, &ipaddr, 64);
     PRINTF("created a new RPL dag\n");
   } else {
diff --git a/examples/ipv6/simple-udp-rpl/unicast-receiver.c b/examples/ipv6/simple-udp-rpl/unicast-receiver.c
index 1100886b441d2ba1f154e25fafca6b41a549279f..7c6205daba96f25899373bf5687e7b708b2a79fa 100644
--- a/examples/ipv6/simple-udp-rpl/unicast-receiver.c
+++ b/examples/ipv6/simple-udp-rpl/unicast-receiver.c
@@ -80,7 +80,7 @@ set_global_address(void)
   int i;
   uint8_t state;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -109,7 +109,7 @@ create_rpl_dag(uip_ipaddr_t *ipaddr)
     
     rpl_set_root(RPL_DEFAULT_INSTANCE, ipaddr);
     dag = rpl_get_any_dag();
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_set_prefix(dag, &prefix, 64);
     PRINTF("created a new RPL dag\n");
   } else {
diff --git a/examples/ipv6/simple-udp-rpl/unicast-sender.c b/examples/ipv6/simple-udp-rpl/unicast-sender.c
index 60cb91204c09f2f8df0a69a2da2f424f768d1355..f441ec728c8b0e4345382e74db98fff8223d9be2 100644
--- a/examples/ipv6/simple-udp-rpl/unicast-sender.c
+++ b/examples/ipv6/simple-udp-rpl/unicast-sender.c
@@ -78,7 +78,7 @@ set_global_address(void)
   int i;
   uint8_t state;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
diff --git a/examples/ipv6/sky-websense/Makefile b/examples/ipv6/sky-websense/Makefile
index 17385c016e60125e48181be3728c264350008a38..7096128a42629dcebbc0d9453156eb0007733243 100644
--- a/examples/ipv6/sky-websense/Makefile
+++ b/examples/ipv6/sky-websense/Makefile
@@ -16,7 +16,7 @@ $(CONTIKI)/tools/tunslip6:	$(CONTIKI)/tools/tunslip6.c
 	(cd $(CONTIKI)/tools && $(MAKE) tunslip6)
 
 connect-router:	$(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 fd00::1/64
 
 connect-router-cooja:	$(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 fd00::1/64
diff --git a/examples/ipv6/sky-websense/README.md b/examples/ipv6/sky-websense/README.md
index 64e566b179427656b932de1ddc30f85905045a15..ab644f88734636b6380a4013ac3aa7dc8d97b37b 100644
--- a/examples/ipv6/sky-websense/README.md
+++ b/examples/ipv6/sky-websense/README.md
@@ -17,8 +17,8 @@ To test the example in COOJA under Linux
     make connect-router-cooja
 
 3. You should now be able to browse to the nodes using your web browser:
-   Router: http://[aaaa::0212:7401:0001:0101]/
-   Node 2: http://[aaaa::0212:7402:0002:0202]/
+   Router: http://[fd00::0212:7401:0001:0101]/
+   Node 2: http://[fd00::0212:7402:0002:0202]/
 
 
 To run the example on real nodes under Linux
diff --git a/examples/ipv6/sky-websense/websense-remote.c b/examples/ipv6/sky-websense/websense-remote.c
index 75737b4848b7245a3f2d7b00209ed81013a0a5b5..76fc7d0a7f6595cc1c98f3f903ad69959fdf8e52 100644
--- a/examples/ipv6/sky-websense/websense-remote.c
+++ b/examples/ipv6/sky-websense/websense-remote.c
@@ -44,13 +44,13 @@
 #include <stdio.h>
 
 /* The address of the server to register the services for this node */
-#define SERVER       "[aaaa::1]"
+#define SERVER       "[fd00::1]"
 
 /* This command registers two services (/0 and /1) to turn the leds on or off */
 #define REGISTER_COMMAND "/r?p=0&d=Turn%20off%20leds&p=1&d=Turn%20on%20leds"
 
 /* The address of the other node to control */
-#define OTHER_NODE   "[aaaa::1]"
+#define OTHER_NODE   "[fd00::1]"
 
 /* The commands to send to the other node */
 #define SET_LEDS_ON  "/1"
diff --git a/examples/jn516x/rpl/README.md b/examples/jn516x/rpl/README.md
index 39a213268942721b2197908a2f640d63abf5d8dd..fb8cd49b4190fb133716b290bc1f36b66caa6221 100644
--- a/examples/jn516x/rpl/README.md
+++ b/examples/jn516x/rpl/README.md
@@ -28,7 +28,7 @@ From a Linux terminal, go to `contiki/examples/jn516x/rpl/border-router` and do
 or `make connect-router-sw` if you have **SW flow control**
 
 This will start a tunnel interface (tun0) on the host machine.
-All traffic towards our network (prefix aaaa::1/64) will now be routed to the border router.
+All traffic towards our network (prefix fd00::1/64) will now be routed to the border router.
 
 ## RPL Node
 
diff --git a/examples/jn516x/rpl/border-router/Makefile b/examples/jn516x/rpl/border-router/Makefile
index de68ecde8e23921ee400fd85befc8e92ef71ec02..1904e5ce827636a83ceaf73d70b92d33b698aefb 100644
--- a/examples/jn516x/rpl/border-router/Makefile
+++ b/examples/jn516x/rpl/border-router/Makefile
@@ -14,7 +14,7 @@ CFLAGS += -DPROJECT_CONF_H=\"project-conf.h\"
 PROJECT_SOURCEFILES += slip-bridge.c slip.c
 
 ifeq ($(PREFIX),)
- PREFIX = aaaa::1/64
+ PREFIX = fd00::1/64
 endif
 
 include $(CONTIKI)/Makefile.include
diff --git a/examples/jn516x/rpl/coap-dongle-node/dongle-node.c b/examples/jn516x/rpl/coap-dongle-node/dongle-node.c
index ab5845dffe5f13c0277cc794a9a8185d7cca209a..2338346102ad5588193453612d5d8f349ae47286 100644
--- a/examples/jn516x/rpl/coap-dongle-node/dongle-node.c
+++ b/examples/jn516x/rpl/coap-dongle-node/dongle-node.c
@@ -33,6 +33,7 @@
  */
 #include "contiki.h"
 #include "net/ip/uip.h"
+#include "net/ipv6/uip-ds6.h"
 #include "tools/rpl-tools.h"
 #include "rest-engine.h"
 #include "sys/ctimer.h"
@@ -130,7 +131,7 @@ PROCESS_THREAD(start_app, ev, data)
   /* Start net stack */
   if(is_coordinator) {
     uip_ipaddr_t prefix;
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_tools_init(&prefix);
   } else {
     rpl_tools_init(NULL);
diff --git a/examples/jn516x/rpl/coap-dr1175-node/dr1175-node.c b/examples/jn516x/rpl/coap-dr1175-node/dr1175-node.c
index f377dc3b3b8c92e450b967934c468ef7467f70b0..641f3eca5a6c6e09d781598265aa281c40c90679 100644
--- a/examples/jn516x/rpl/coap-dr1175-node/dr1175-node.c
+++ b/examples/jn516x/rpl/coap-dr1175-node/dr1175-node.c
@@ -34,6 +34,7 @@
 
 #include "contiki.h"
 #include "net/ip/uip.h"
+#include "net/ipv6/uip-ds6.h"
 #include "tools/rpl-tools.h"
 #include "rest-engine.h"
 #include "light-sensor.h"
@@ -350,7 +351,7 @@ PROCESS_THREAD(start_app, ev, data)
   /* Start net stack */
   if(is_coordinator) {
     uip_ipaddr_t prefix;
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_tools_init(&prefix);
   } else {
     rpl_tools_init(NULL);
diff --git a/examples/jn516x/rpl/coap-dr1199-node/dr1199-node.c b/examples/jn516x/rpl/coap-dr1199-node/dr1199-node.c
index 373922e5808b88fd3c9332f83fcf7278038e0438..933b247d6d702885c5bea4534ea9bfbd31dc1c0f 100644
--- a/examples/jn516x/rpl/coap-dr1199-node/dr1199-node.c
+++ b/examples/jn516x/rpl/coap-dr1199-node/dr1199-node.c
@@ -33,6 +33,7 @@
  */
 #include "contiki.h"
 #include "net/ip/uip.h"
+#include "net/ipv6/uip-ds6.h"
 #include "tools/rpl-tools.h"
 #include "rest-engine.h"
 #include "dev/leds.h"
@@ -351,7 +352,7 @@ PROCESS_THREAD(start_app, ev, data)
   /* Start net stack */
   if(is_coordinator) {
     uip_ipaddr_t prefix;
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_tools_init(&prefix);
   } else {
     rpl_tools_init(NULL);
diff --git a/examples/jn516x/rpl/node/node.c b/examples/jn516x/rpl/node/node.c
index 59b812357d0008ef3b629f5cac0da471b96d7c79..b6a6f3096eecd5582d5ffde2b344cdc59a394d13 100644
--- a/examples/jn516x/rpl/node/node.c
+++ b/examples/jn516x/rpl/node/node.c
@@ -36,6 +36,7 @@
  */
 
 #include "contiki.h"
+#include "net/ipv6/uip-ds6.h"
 #include "net/rpl/rpl.h"
 #include "tools/rpl-tools.h"
 
@@ -98,7 +99,7 @@ PROCESS_THREAD(node_process, ev, data)
 
   if(is_coordinator) {
     uip_ipaddr_t prefix;
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_tools_init(&prefix);
   } else {
     rpl_tools_init(NULL);
diff --git a/examples/mbxxx/mbxxx-websense/Makefile b/examples/mbxxx/mbxxx-websense/Makefile
index 6239a70430188949062427655953451053116859..accb4e4126a2487e43bbbde2c201d8fae7ea8327 100644
--- a/examples/mbxxx/mbxxx-websense/Makefile
+++ b/examples/mbxxx/mbxxx-websense/Makefile
@@ -16,7 +16,7 @@ $(CONTIKI)/tools/tunslip6:     $(CONTIKI)/tools/tunslip6.c
 	(cd $(CONTIKI)/tools && $(MAKE) tunslip6)
 
 connect-router:        $(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 fd00::1/64
 
 connect-router-cooja:  $(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 fd00::1/64
diff --git a/examples/mbxxx/udp-ipv6-sleep/udp-client.c b/examples/mbxxx/udp-ipv6-sleep/udp-client.c
index 4408a2c1976dfea0b97c62c4acbcbda8678e9c87..3c6f7934de64f069e8b640537367df7606d19af4 100644
--- a/examples/mbxxx/udp-ipv6-sleep/udp-client.c
+++ b/examples/mbxxx/udp-ipv6-sleep/udp-client.c
@@ -107,7 +107,7 @@ set_global_address(void)
 {
   uip_ipaddr_t ipaddr;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 }
@@ -123,7 +123,7 @@ set_connection_address(uip_ipaddr_t *ipaddr)
     PRINTF("UDP client failed to parse address '%s'\n", QUOTEME(UDP_CONNECTION_ADDR));
   }
 #elif UIP_CONF_ROUTER
-  uip_ip6addr(ipaddr,0xaaaa,0,0,0,0x0280,0xe102,0x0000,0x008a);
+  uip_ip6addr(ipaddr,UIP_DS6_DEFAULT_PREFIX,0,0,0,0x0280,0xe102,0x0000,0x008a);
 #else
   uip_ip6addr(ipaddr,0xfe80,0,0,0,0x0280,0xe102,0x0000,0x008a);
 #endif /* UDP_CONNECTION_ADDR */
diff --git a/examples/mbxxx/udp-ipv6-sleep/udp-server.c b/examples/mbxxx/udp-ipv6-sleep/udp-server.c
index 68fc1915c9ec9e347de5976708842918bf23b23a..78c6f9d3a8420290d4c4d0e21869152f542cc696 100644
--- a/examples/mbxxx/udp-ipv6-sleep/udp-server.c
+++ b/examples/mbxxx/udp-ipv6-sleep/udp-server.c
@@ -95,7 +95,7 @@ PROCESS_THREAD(udp_server_process, ev, data)
   PRINTF("UDP server started\n");
 
 #if UIP_CONF_ROUTER
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 #endif /* UIP_CONF_ROUTER */
diff --git a/examples/servreg-hack/example-servreg-client.c b/examples/servreg-hack/example-servreg-client.c
index 108d40aeb9f42a649fbfdb37c8fb2c472c7b3166..4557fab71682f0f0fda582717d146a930328dba8 100644
--- a/examples/servreg-hack/example-servreg-client.c
+++ b/examples/servreg-hack/example-servreg-client.c
@@ -54,7 +54,7 @@ set_global_address(void)
 {
   uip_ipaddr_t ipaddr;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 }
diff --git a/examples/servreg-hack/example-servreg-server.c b/examples/servreg-hack/example-servreg-server.c
index 01dd7175ac67da86d6d53a67a3c7b991c4aa4952..4ff70060c344aedcbc9b88983215686c6fb17306 100644
--- a/examples/servreg-hack/example-servreg-server.c
+++ b/examples/servreg-hack/example-servreg-server.c
@@ -53,7 +53,7 @@ PROCESS_THREAD(example_servreg_server_process, ev, data)
   PROCESS_BEGIN();
 
   /* Set a global address. */
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
diff --git a/examples/udp-ipv6/udp-client.c b/examples/udp-ipv6/udp-client.c
index 7f9b7659e00ee9a963f35e6aee4fbf10b31b54a8..85854a48ba23a157140a21106462f7476c081e77 100644
--- a/examples/udp-ipv6/udp-client.c
+++ b/examples/udp-ipv6/udp-client.c
@@ -98,7 +98,7 @@ set_global_address(void)
 {
   uip_ipaddr_t ipaddr;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 }
@@ -111,7 +111,7 @@ set_connection_address(uip_ipaddr_t *ipaddr)
 #if RESOLV_CONF_SUPPORTS_MDNS
 #define UDP_CONNECTION_ADDR       contiki-udp-server.local
 #elif UIP_CONF_ROUTER
-#define UDP_CONNECTION_ADDR       aaaa:0:0:0:0212:7404:0004:0404
+#define UDP_CONNECTION_ADDR       fd00:0:0:0:0212:7404:0004:0404
 #else
 #define UDP_CONNECTION_ADDR       fe80:0:0:0:6466:6666:6666:6666
 #endif
diff --git a/examples/udp-ipv6/udp-server.c b/examples/udp-ipv6/udp-server.c
index c56720f9ae83dd9a19820c01ee8924ad639b95de..eeb7de7000da24340d720c0f1f31b047bb8fcb99 100644
--- a/examples/udp-ipv6/udp-server.c
+++ b/examples/udp-ipv6/udp-server.c
@@ -99,7 +99,7 @@ PROCESS_THREAD(udp_server_process, ev, data)
 #endif
 
 #if UIP_CONF_ROUTER
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 #endif /* UIP_CONF_ROUTER */
diff --git a/examples/udp-stream/udp-stream.c b/examples/udp-stream/udp-stream.c
index c10e8d6a559df51e774ed9e07d89501e2b524fd9..875b594d80b404637a651fe637ecc4e8ce1de17c 100644
--- a/examples/udp-stream/udp-stream.c
+++ b/examples/udp-stream/udp-stream.c
@@ -74,7 +74,7 @@ set_global_address(void)
   int i;
   uint8_t state;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -102,7 +102,7 @@ create_rpl_dag(uip_ipaddr_t *ipaddr)
 
     rpl_set_root(RPL_DEFAULT_INSTANCE, ipaddr);
     dag = rpl_get_any_dag();
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_set_prefix(dag, &prefix, 64);
     printf("created a new RPL dag\n");
   } else {
diff --git a/examples/webserver-ipv6/README.md b/examples/webserver-ipv6/README.md
index ddeb5cb8782bb3cc7a771e5a58fae71a6150f4a8..fae6057a1732ab66b90ea7d360c743f9da7db9ac 100644
--- a/examples/webserver-ipv6/README.md
+++ b/examples/webserver-ipv6/README.md
@@ -41,7 +41,7 @@ On linux you can set up router advertisements as follows:
 
 - You might need to add a route:
 
-        ip -6 route add aaaa:0000:0000:0000:0206:98ff:fe00:0232/64 dev tap0
+        ip -6 route add fd00:0000:0000:0000:0206:98ff:fe00:0232/64 dev tap0
 
 - Then configure a global address by sending a router advertisement (RA) with a
   prefix option. You can use radvd for example to generate such a packet.
diff --git a/examples/zolertia/z1/ipv6/z1-websense/Makefile b/examples/zolertia/z1/ipv6/z1-websense/Makefile
index 717802ae962e87c5f594bfdb945c773105dc34da..8db74458e591552c2d7feb30c3bdce01fa13a68c 100644
--- a/examples/zolertia/z1/ipv6/z1-websense/Makefile
+++ b/examples/zolertia/z1/ipv6/z1-websense/Makefile
@@ -18,10 +18,10 @@ $(CONTIKI)/tools/tunslip6:	$(CONTIKI)/tools/tunslip6.c
 	(cd $(CONTIKI)/tools && $(MAKE) tunslip6)
 
 connect-router:	$(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 fd00::1/64
 
 connect-router-cooja:	$(CONTIKI)/tools/tunslip6
-	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 aaaa::1/64
+	sudo $(CONTIKI)/tools/tunslip6 -a 127.0.0.1 fd00::1/64
 
 CUSTOM_RULE_LINK=1 
 %.$(TARGET): %.co $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) contiki-$(TARGET).a $(LD) $(LDFLAGS) $(TARGET_STARTFILES) ${filter-out %.a,$^} ${filter %.a,$^} $(TARGET_LIBFILES) -o $@ -lm
diff --git a/examples/zolertia/z1/ipv6/z1-websense/README.md b/examples/zolertia/z1/ipv6/z1-websense/README.md
index af373adc68564920f4f81d96b8d0a0e7180523c1..82e7f34ee34f117da2e29f9aa386c1d764b4be2f 100644
--- a/examples/zolertia/z1/ipv6/z1-websense/README.md
+++ b/examples/zolertia/z1/ipv6/z1-websense/README.md
@@ -19,8 +19,8 @@ To test the example in COOJA under Linux
 
 3. You should now be able to browse to the nodes using your web browser:
 
-   Router: http://[aaaa::0212:7401:0001:0101]/
-   Node 2: http://[aaaa::0212:7402:0002:0202]/
+   Router: http://[fd00::0212:7401:0001:0101]/
+   Node 2: http://[fd00::0212:7402:0002:0202]/
 
 
 To run the example on real nodes under Linux
diff --git a/examples/zolertia/z1/ipv6/z1-websense/websense-remote.c b/examples/zolertia/z1/ipv6/z1-websense/websense-remote.c
index 7cfebd3557c40aecdf6bf4f948ccf4ead2ca4d10..a6336260d796dba22c02fb6f59a69f6bc9ea62bc 100644
--- a/examples/zolertia/z1/ipv6/z1-websense/websense-remote.c
+++ b/examples/zolertia/z1/ipv6/z1-websense/websense-remote.c
@@ -45,13 +45,13 @@
 #include <stdio.h>
 /*---------------------------------------------------------------------------*/
 /* The address of the server to register the services for this node */
-#define SERVER       "aaaa::1"
+#define SERVER       "fd00::1"
 
 /* This command registers two services (/0 and /1) to turn the leds on or off */
 #define REGISTER_COMMAND "/r?p=0&d=Turn%20off%20leds&p=1&d=Turn%20on%20leds"
 
 /* The address of the other node to control */
-#define OTHER_NODE   "aaaa::212:7403:3:303"
+#define OTHER_NODE   "fd00::212:7403:3:303"
 
 /* The commands to send to the other node */
 #define SET_LEDS_ON  "/1"
diff --git a/platform/avr-atmega128rfa1/apps/raven-ipso/raven-ipso.c b/platform/avr-atmega128rfa1/apps/raven-ipso/raven-ipso.c
index 214a64efe2421fe1c6b24111ec38c9722b1b3e72..04802951a828ea84769b52ab2c8ee4bba898a24c 100644
--- a/platform/avr-atmega128rfa1/apps/raven-ipso/raven-ipso.c
+++ b/platform/avr-atmega128rfa1/apps/raven-ipso/raven-ipso.c
@@ -95,7 +95,7 @@ raven_ping6(void)
   /* ping ipv6.google.com*/
   uip_ip6addr(&ping_addr,0x2001,0x420,0x5FFF,0x7D,0x2D0,0xB7FF,0xFE23,0xE6DB);
   //uip_ip6addr(&ping_addr, 0x2001, 0x4860, 0, 0x2001, 0, 0, 0, 0x68);
-  //uip_ip6addr(&ping_addr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+  //uip_ip6addr(&ping_addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 1);
   
   UIP_IP_BUF->vtc = 0x60;
   UIP_IP_BUF->tcflow = 1;
diff --git a/platform/avr-atmega128rfa1/contiki-conf.h b/platform/avr-atmega128rfa1/contiki-conf.h
index 9dfbd9518b7c51066d41cce71bc61f02de861799..9cad6d3b8c8af1c9a6f050b7ac0d3fa66ac074ee 100644
--- a/platform/avr-atmega128rfa1/contiki-conf.h
+++ b/platform/avr-atmega128rfa1/contiki-conf.h
@@ -151,10 +151,10 @@ typedef unsigned short uip_stats_t;
 #define UIP_CONF_LLH_LEN          0
 
 /* 10 bytes per stateful address context - see sicslowpan.c */
-/* Default is 1 context with prefix aaaa::/64 */
+/* Default is 1 context with prefix fd00::/64 */
 /* These must agree with all the other nodes or there will be a failure to communicate! */
 #define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS 1
-#define SICSLOWPAN_CONF_ADDR_CONTEXT_0 {addr_contexts[0].prefix[0]=0xaa;addr_contexts[0].prefix[1]=0xaa;}
+#define SICSLOWPAN_CONF_ADDR_CONTEXT_0 {addr_contexts[0].prefix[0]=UIP_DS6_DEFAULT_PREFIX_0;addr_contexts[0].prefix[1]=UIP_DS6_DEFAULT_PREFIX_1;}
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_1 {addr_contexts[1].prefix[0]=0xbb;addr_contexts[1].prefix[1]=0xbb;}
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_2 {addr_contexts[2].prefix[0]=0x20;addr_contexts[2].prefix[1]=0x01;addr_contexts[2].prefix[2]=0x49;addr_contexts[2].prefix[3]=0x78,addr_contexts[2].prefix[4]=0x1d;addr_contexts[2].prefix[5]=0xb1;}
 
diff --git a/platform/avr-atmega128rfa1/contiki-main.c b/platform/avr-atmega128rfa1/contiki-main.c
index 8d2d8f9b7d37e38afa761a79d9e9a051155cee4c..ec22d58f63b98ddbe21ac9eaa6981045e77dd0c4 100644
--- a/platform/avr-atmega128rfa1/contiki-main.c
+++ b/platform/avr-atmega128rfa1/contiki-main.c
@@ -340,7 +340,7 @@ uint8_t i;
 #if 0
 {  
   uip_ip6addr_t ipaddr;
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 //  uip_ds6_prefix_add(&ipaddr,64,0);
 }
diff --git a/platform/avr-raven/apps/raven-ipso/raven-ipso.c b/platform/avr-raven/apps/raven-ipso/raven-ipso.c
index 2b51ac519d711108e0c860f2dde94c93113e6786..5779e814bd8677357db426e7aff49ad18f16eedf 100644
--- a/platform/avr-raven/apps/raven-ipso/raven-ipso.c
+++ b/platform/avr-raven/apps/raven-ipso/raven-ipso.c
@@ -95,7 +95,7 @@ raven_ping6(void)
   /* ping ipv6.google.com*/
   uip_ip6addr(&ping_addr,0x2001,0x420,0x5FFF,0x7D,0x2D0,0xB7FF,0xFE23,0xE6DB);
   //uip_ip6addr(&ping_addr, 0x2001, 0x4860, 0, 0x2001, 0, 0, 0, 0x68);
-  //uip_ip6addr(&ping_addr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+  //uip_ip6addr(&ping_addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 1);
   
   UIP_IP_BUF->vtc = 0x60;
   UIP_IP_BUF->tcflow = 1;
diff --git a/platform/avr-raven/contiki-conf.h b/platform/avr-raven/contiki-conf.h
index aa97db2e57f6b447d250f6b543d85b088e29a0a1..ab770540d0d3326a1ce3926051042471fad78b65 100644
--- a/platform/avr-raven/contiki-conf.h
+++ b/platform/avr-raven/contiki-conf.h
@@ -167,10 +167,10 @@ typedef unsigned short uip_stats_t;
 #define UIP_CONF_LLH_LEN         0
 
 /* 10 bytes per stateful address context - see sicslowpan.c */
-/* Default is 1 context with prefix aaaa::/64 */
+/* Default is 1 context with prefix fd00::/64 */
 /* These must agree with all the other nodes or there will be a failure to communicate! */
 #define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS 1
-#define SICSLOWPAN_CONF_ADDR_CONTEXT_0 {addr_contexts[0].prefix[0]=0xaa;addr_contexts[0].prefix[1]=0xaa;}
+#define SICSLOWPAN_CONF_ADDR_CONTEXT_0 {addr_contexts[0].prefix[0]=UIP_DS6_DEFAULT_PREFIX_0;addr_contexts[0].prefix[1]=UIP_DS6_DEFAULT_PREFIX_1;}
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_1 {addr_contexts[1].prefix[0]=0xbb;addr_contexts[1].prefix[1]=0xbb;}
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_2 {addr_contexts[2].prefix[0]=0x20;addr_contexts[2].prefix[1]=0x01;addr_contexts[2].prefix[2]=0x49;addr_contexts[2].prefix[3]=0x78,addr_contexts[2].prefix[4]=0x1d;addr_contexts[2].prefix[5]=0xb1;}
 
diff --git a/platform/avr-raven/contiki-raven-default-init-net.c b/platform/avr-raven/contiki-raven-default-init-net.c
index 61fc23213e9597aed3d886467842aa5c58d5672a..ca29e34fb13c292fe9543d77f87e6f0b01795647 100644
--- a/platform/avr-raven/contiki-raven-default-init-net.c
+++ b/platform/avr-raven/contiki-raven-default-init-net.c
@@ -44,7 +44,7 @@ init_net(void)
 
 /*  uip_ipaddr_t ipprefix;
 
-  uip_ip6addr(&ipprefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipprefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
 
   uip_netif_addr_add(&ipprefix, UIP_DEFAULT_PREFIX_LEN, 0, AUTOCONF);
   uip_nd6_prefix_add(&ipprefix, UIP_DEFAULT_PREFIX_LEN, 0);
diff --git a/platform/avr-raven/contiki-raven-main.c b/platform/avr-raven/contiki-raven-main.c
index 723bd943666d821e91c3d22bc438d569df9dc80a..274bdf2ffc480a051faf1a038d5f139bbae30c84 100644
--- a/platform/avr-raven/contiki-raven-main.c
+++ b/platform/avr-raven/contiki-raven-main.c
@@ -357,7 +357,7 @@ uint8_t i;
 #if 0
 {  
   uip_ip6addr_t ipaddr;
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 //  uip_ds6_prefix_add(&ipaddr,64,0);
 }
diff --git a/platform/avr-ravenusb/contiki-conf.h b/platform/avr-ravenusb/contiki-conf.h
index c6cab8c549b1599315470ab0f4aa789bd174ad85..71d56e248de54b7cdbd64cafa5d5abd7b991f273 100644
--- a/platform/avr-ravenusb/contiki-conf.h
+++ b/platform/avr-ravenusb/contiki-conf.h
@@ -236,10 +236,10 @@ extern void mac_log_802_15_4_rx(const uint8_t* buffer, size_t total_len);
 #define UIP_CONF_BUFSIZE		 UIP_LINK_MTU + UIP_LLH_LEN + 4   /* +4 for vlan on macosx */
 
 /* 10 bytes per stateful address context - see sicslowpan.c */
-/* Default is 1 context with prefix aaaa::/64 */
+/* Default is 1 context with prefix fd00::/64 */
 /* These must agree with all the other nodes or there will be a failure to communicate! */
 #//define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS 1
-#define SICSLOWPAN_CONF_ADDR_CONTEXT_0 {addr_contexts[0].prefix[0]=0xaa;addr_contexts[0].prefix[1]=0xaa;}
+#define SICSLOWPAN_CONF_ADDR_CONTEXT_0 {addr_contexts[0].prefix[0]=UIP_DS6_DEFAULT_PREFIX_0;addr_contexts[0].prefix[1]=UIP_DS6_DEFAULT_PREFIX_1;}
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_1 {addr_contexts[1].prefix[0]=0xbb;addr_contexts[1].prefix[1]=0xbb;}
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_2 {addr_contexts[2].prefix[0]=0x20;addr_contexts[2].prefix[1]=0x01;addr_contexts[2].prefix[2]=0x49;addr_contexts[2].prefix[3]=0x78,addr_contexts[2].prefix[4]=0x1d;addr_contexts[2].prefix[5]=0xb1;}
 
diff --git a/platform/cc2530dk/contiki-conf.h b/platform/cc2530dk/contiki-conf.h
index 5d3beb6bbd3e2d33814a59c9360e507ea19e971d..9c79aa82854bcc15735a7152d8c8876ee08ce756 100644
--- a/platform/cc2530dk/contiki-conf.h
+++ b/platform/cc2530dk/contiki-conf.h
@@ -259,8 +259,8 @@
 /* Define our IPv6 prefixes/contexts here */
 #define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS    1
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_0 { \
-  addr_contexts[0].prefix[0] = 0xaa; \
-  addr_contexts[0].prefix[1] = 0xaa; \
+  addr_contexts[0].prefix[0] = UIP_DS6_DEFAULT_PREFIX_0; \
+  addr_contexts[0].prefix[1] = UIP_DS6_DEFAULT_PREFIX_1; \
 }
 
 #define MAC_CONF_CHANNEL_CHECK_RATE          8
diff --git a/platform/cc2538dk/README.md b/platform/cc2538dk/README.md
index 998a574b362ca5736d57b05cb445afa4128e982b..4bcb2c6f4962a2555de9904465e86fd8e823086d 100644
--- a/platform/cc2538dk/README.md
+++ b/platform/cc2538dk/README.md
@@ -308,14 +308,14 @@ Start by building a border router from `examples/ipv6/rpl-border-router`
   * Connect device to Linux or OS X over its XDS port.
   * `cd $(CONTIKI)/tools`
   * `make tunslip6`
-  * `sudo $(CONTIKI)/tools/tunslip6 -s /dev/<device> aaaa::1/64`
+  * `sudo $(CONTIKI)/tools/tunslip6 -s /dev/<device> fd00::1/64`
   * The router will print its own IPv6 address. Use it below.
 
         Got configuration message of type P
-        Setting prefix aaaa::
+        Setting prefix fd00::
         created a new RPL dag
         Server IPv6 addresses:
-         aaaa::212:4b00:89ab:cdef
+         fd00::212:4b00:89ab:cdef
          fe80::212:4b00:89ab:cdef
 
   * `ping6 <address>`
diff --git a/platform/cc2538dk/contiki-conf.h b/platform/cc2538dk/contiki-conf.h
index 34a7f1673154b678b3b5b77898bf7fecc75ec99e..ad9aafeeb4f78f2cd5eda3ad72e44a6365fd0ea8 100644
--- a/platform/cc2538dk/contiki-conf.h
+++ b/platform/cc2538dk/contiki-conf.h
@@ -472,8 +472,8 @@ typedef uint32_t rtimer_clock_t;
 #define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS    1
 #ifndef SICSLOWPAN_CONF_ADDR_CONTEXT_0
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_0 { \
-  addr_contexts[0].prefix[0] = 0xaa; \
-  addr_contexts[0].prefix[1] = 0xaa; \
+  addr_contexts[0].prefix[0] = UIP_DS6_DEFAULT_PREFIX_0; \
+  addr_contexts[0].prefix[1] = UIP_DS6_DEFAULT_PREFIX_1; \
 }
 #endif
 
diff --git a/platform/cooja-ip64/contiki-cooja-ip64-main.c b/platform/cooja-ip64/contiki-cooja-ip64-main.c
index 3bc94f8646a326a1631e8ba2c4ba49c2602d04fc..02576a3bea730d82f497972f0706a0e5be5e4d17 100644
--- a/platform/cooja-ip64/contiki-cooja-ip64-main.c
+++ b/platform/cooja-ip64/contiki-cooja-ip64-main.c
@@ -217,7 +217,7 @@ contiki_init(void)
   printf("%02x%02x\n", lladdr->ipaddr.u8[14],
          lladdr->ipaddr.u8[15]);
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
   printf("Tentative global IPv6 address ");
diff --git a/platform/cooja/contiki-cooja-main.c b/platform/cooja/contiki-cooja-main.c
index f251c9178a3d801976694029445e9172d980f511..40dd49d1c6780282056ebdfceed88feecdf40509 100644
--- a/platform/cooja/contiki-cooja-main.c
+++ b/platform/cooja/contiki-cooja-main.c
@@ -304,7 +304,7 @@ contiki_init()
     if(1) {
       uip_ipaddr_t ipaddr;
       int i;
-      uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+      uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
       uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
       uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
       printf("Tentative global IPv6 address ");
diff --git a/platform/ev-aducrf101mkxz/README.md b/platform/ev-aducrf101mkxz/README.md
index a4cf4dcb4de9f67b27e70af3516ed5b6fc7264ba..5dd7c5b06597945f427035ca5c8e4f3745d42975 100644
--- a/platform/ev-aducrf101mkxz/README.md
+++ b/platform/ev-aducrf101mkxz/README.md
@@ -71,9 +71,9 @@ the SLIP tunnel on the host machine:
 
     sudo contiki/tools/tunslip6 \
         -s /dev/serial/by-id/usb-SEGGER_J-Link_000541011111-if00 \
-        -B 115200 -v3 aaaa::1/64
+        -B 115200 -v3 fd00::1/64
 
-Open the border router's home page at: http://[aaaa::3230:3030:3132:3334]/
+Open the border router's home page at: http://[fd00::3230:3030:3132:3334]/
 
 #### Web Server ####
 
@@ -90,7 +90,7 @@ router:
     adi-cm3sd/cm3sd.py -a contiki/examples/webserver-ipv6/webserver6.ev-aducrf101mkxz.hex \
         /dev/serial/by-id/usb-SEGGER_J-Link_000541022222-if00
 
-Open the web server's home page at: http://[aaaa::3230:3030:3536:3738]/
+Open the web server's home page at: http://[fd00::3230:3030:3536:3738]/
 
 On Windows:
 -----------
diff --git a/platform/eval-adf7xxxmb4z/README.md b/platform/eval-adf7xxxmb4z/README.md
index 1faa1a6254f4ba13559d6081707ebaf7042694df..dc023e7662e64d368cb563bf8b5ebc662195e8ff 100644
--- a/platform/eval-adf7xxxmb4z/README.md
+++ b/platform/eval-adf7xxxmb4z/README.md
@@ -51,9 +51,9 @@ Build and run the SLIP tunnel on the host machine.
 Here it is assumed that the Secondary UART USB port (J3) is attached to /dev/ttyUSB1:
 
 	make -C contiki/tools tunslip6
-	sudo contiki/tools/tunslip6 -B 38400 -s /dev/ttyUSB1 -v3 aaaa::1/64
+	sudo contiki/tools/tunslip6 -B 38400 -s /dev/ttyUSB1 -v3 fd00::1/64
 
-Open the border router home page at http://[aaaa::302:304:506:708]/
+Open the border router home page at http://[fd00::302:304:506:708]/
 
 Build and run the IPv6 web server example on another eval board.
 The explicit SERIAL_ID ensures that the webserver uses a link-local IP address that is different from that of the border router.
@@ -61,7 +61,7 @@ The explicit SERIAL_ID ensures that the webserver uses a link-local IP address t
 	make -C contiki/examples/webserver-ipv6 TARGET=eval-adf7xxxmb4z SERIAL_ID='"\x01\x02\x03\x04\x05\x06\x07\x09"' webserver6.eval-adf7xxxmb4z.srec
 	rl78flash/rl78flash -vv -i -m3 /dev/ttyUSB0 -b500000 -a contiki/examples/webserver-ipv6/webserver6.eval-adf7xxxmb4z.srec
 
-Open the web server's home page at http://[aaaa::7a30:3178:3032:7830]
+Open the web server's home page at http://[fd00::7a30:3178:3032:7830]
 
 
 On Windows:
diff --git a/platform/exp5438/contiki-exp5438-main.c b/platform/exp5438/contiki-exp5438-main.c
index 2f85f6ba27de8b62b4c6a3da2a57b8b008bb1400..321bb91713352051df1e53b72b2ea530502325db 100644
--- a/platform/exp5438/contiki-exp5438-main.c
+++ b/platform/exp5438/contiki-exp5438-main.c
@@ -236,7 +236,7 @@ main(int argc, char **argv)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     printf("Tentative global IPv6 address ");
diff --git a/platform/jn516x/contiki-jn516x-main.c b/platform/jn516x/contiki-jn516x-main.c
index 8c88a10df0020e75c4373cd0805310b858379e57..171b94a2a61ce766baae946d26168c402849e4d0 100644
--- a/platform/jn516x/contiki-jn516x-main.c
+++ b/platform/jn516x/contiki-jn516x-main.c
@@ -226,7 +226,7 @@ start_uip6(void)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     PRINTF("Tentative global IPv6 address ");
diff --git a/platform/mbxxx/contiki-main.c b/platform/mbxxx/contiki-main.c
index c383b0f610f8772921864e519d4ee372d565cded..700fbb5ccedcd6a85915a9e4522a5144bb8e5ca4 100644
--- a/platform/mbxxx/contiki-main.c
+++ b/platform/mbxxx/contiki-main.c
@@ -214,7 +214,7 @@ main(void)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     printf("Tentative global IPv6 address ");
diff --git a/platform/micaz/init-net.c b/platform/micaz/init-net.c
index 271b402c8bfc1ab04f66fb3dd10906a90d2a2130..9c09fe4ae568a735d731f537948612ecbd6cad03 100644
--- a/platform/micaz/init-net.c
+++ b/platform/micaz/init-net.c
@@ -177,7 +177,7 @@ init_net(void)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     printf_P(PSTR("Tentative global IPv6 address "));
diff --git a/platform/minimal-net/contiki-main.c b/platform/minimal-net/contiki-main.c
index 35b466a39b784f30d49630d2e0a37a66e1467e74..90d700876b36aac6ff7229c3671cad8a7b5ce605 100644
--- a/platform/minimal-net/contiki-main.c
+++ b/platform/minimal-net/contiki-main.c
@@ -289,7 +289,7 @@ main(int argc, char **argv)
 #ifdef HARD_CODED_ADDRESS
     uiplib_ipaddrconv(HARD_CODED_ADDRESS, &ipaddr);
 #else
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
 #endif
     if((ipaddr.u16[0] != 0) ||
        (ipaddr.u16[1] != 0) ||
diff --git a/platform/sky/contiki-sky-main.c b/platform/sky/contiki-sky-main.c
index ea3afd93a4040adb5b840e5b4af19ecd3f0e48b6..7fe0339007c0c27f3ac1fa09f1e490f9d1c3e836 100644
--- a/platform/sky/contiki-sky-main.c
+++ b/platform/sky/contiki-sky-main.c
@@ -330,7 +330,7 @@ main(int argc, char **argv)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     PRINTF("Tentative global IPv6 address ");
diff --git a/platform/wismote/contiki-wismote-main.c b/platform/wismote/contiki-wismote-main.c
index d65ccaf1eade12b068d364a5902db602b82b51a9..f2a41a48e6428e616c4154111a08130c50a15889 100644
--- a/platform/wismote/contiki-wismote-main.c
+++ b/platform/wismote/contiki-wismote-main.c
@@ -324,7 +324,7 @@ main(int argc, char **argv)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     printf("Tentative global IPv6 address ");
diff --git a/platform/z1/contiki-z1-main.c b/platform/z1/contiki-z1-main.c
index 45e97bde91fe0a5c27db8cb38618c163d0c6015f..477bab9753c47067afeda5f3313b7bbdb37fdec1 100644
--- a/platform/z1/contiki-z1-main.c
+++ b/platform/z1/contiki-z1-main.c
@@ -345,7 +345,7 @@ main(int argc, char **argv)
   if(!UIP_CONF_IPV6_RPL) {
     uip_ipaddr_t ipaddr;
     int i;
-    uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
     uip_ds6_addr_add(&ipaddr, 0, ADDR_TENTATIVE);
     printf("Tentative global IPv6 address ");
diff --git a/platform/zoul/contiki-conf.h b/platform/zoul/contiki-conf.h
index cef99108c961a0a89e3addd276ff23d1f35ece08..52cd22dfd0228a0ead378ed4e3949631413349ad 100644
--- a/platform/zoul/contiki-conf.h
+++ b/platform/zoul/contiki-conf.h
@@ -540,8 +540,8 @@ typedef uint32_t rtimer_clock_t;
 #define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS    1
 #ifndef SICSLOWPAN_CONF_ADDR_CONTEXT_0
 #define SICSLOWPAN_CONF_ADDR_CONTEXT_0 { \
-  addr_contexts[0].prefix[0] = 0xaa; \
-  addr_contexts[0].prefix[1] = 0xaa; \
+  addr_contexts[0].prefix[0] = UIP_DS6_DEFAULT_PREFIX_0; \
+  addr_contexts[0].prefix[1] = UIP_DS6_DEFAULT_PREFIX_1; \
 }
 #endif
 
diff --git a/regression-tests/11-ipv6/code/receiver/udp-receiver.c b/regression-tests/11-ipv6/code/receiver/udp-receiver.c
index 564c2672ee4cb803b68577e14cf6603d3b4952b1..e84c57637db43b12c344037d1328633c7815c1f7 100644
--- a/regression-tests/11-ipv6/code/receiver/udp-receiver.c
+++ b/regression-tests/11-ipv6/code/receiver/udp-receiver.c
@@ -39,7 +39,7 @@ PROCESS_THREAD(udp_process, ev, data)
 
   PROCESS_BEGIN();
 
-  uip_ip6addr(&addr, 0xaaaa, 0, 0, 0, 0, 0, 0, 2);
+  uip_ip6addr(&addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 2);
   uip_ds6_addr_add(&addr, 0, ADDR_AUTOCONF);
 
   simple_udp_register(&broadcast_connection, UDP_PORT,
diff --git a/regression-tests/11-ipv6/code/sender/unicast-sender.c b/regression-tests/11-ipv6/code/sender/unicast-sender.c
index 071e3ac37ec583e09eb4afb11383693b2053c545..10a1399861b4fe9fe37ee081fcec97476ab574c0 100644
--- a/regression-tests/11-ipv6/code/sender/unicast-sender.c
+++ b/regression-tests/11-ipv6/code/sender/unicast-sender.c
@@ -40,12 +40,12 @@ PROCESS_THREAD(udp_process, ev, data)
 
   PROCESS_BEGIN();
 
-  uip_ip6addr(&addr, 0xaaaa, 0, 0, 0, 0, 0, 0, 3);
+  uip_ip6addr(&addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 3);
   uip_ds6_addr_add(&addr, 0, ADDR_AUTOCONF);
 
   rpl_set_root(RPL_DEFAULT_INSTANCE, &addr);
   /*  dag = rpl_get_any_dag();
-  uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   rpl_set_prefix(dag, &prefix, 64);*/
 
 
@@ -63,7 +63,7 @@ PROCESS_THREAD(udp_process, ev, data)
     etimer_reset(&periodic_timer);
 
     printf("Sending unicast\n");
-    uip_ip6addr(&addr, 0xaaaa, 0, 0, 0, 0, 0, 0, 2);
+    uip_ip6addr(&addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 2);
     simple_udp_sendto(&broadcast_connection, buf, sizeof(buf), &addr);
   }
 
diff --git a/regression-tests/12-rpl/code/receiver-node.c b/regression-tests/12-rpl/code/receiver-node.c
index 4ba3cb1488e7623682cfa79d67b6258a8c0142b9..727a23f841f8c2a37596a9959cc03874787de865 100644
--- a/regression-tests/12-rpl/code/receiver-node.c
+++ b/regression-tests/12-rpl/code/receiver-node.c
@@ -73,7 +73,7 @@ set_global_address(void)
   int i;
   uint8_t state;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
diff --git a/regression-tests/12-rpl/code/root-node.c b/regression-tests/12-rpl/code/root-node.c
index 0609e1bd8eedd76c2756029843b0fda860693bf6..fdea828f8f103c4399b47199598c00c45f140224 100644
--- a/regression-tests/12-rpl/code/root-node.c
+++ b/regression-tests/12-rpl/code/root-node.c
@@ -77,7 +77,7 @@ set_global_address(void)
   int i;
   uint8_t state;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -106,7 +106,7 @@ create_rpl_dag(uip_ipaddr_t *ipaddr)
     
     rpl_set_root(RPL_DEFAULT_INSTANCE, ipaddr);
     dag = rpl_get_any_dag();
-    uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+    uip_ip6addr(&prefix, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
     rpl_set_prefix(dag, &prefix, 64);
     PRINTF("created a new RPL dag\n");
   } else {
diff --git a/regression-tests/12-rpl/code/sender-node.c b/regression-tests/12-rpl/code/sender-node.c
index 08d81b62dc62a5184a57a46d4b855bd9c31e8f85..55dfdd15fd60fae44871fb03b1eec0c4fc9e0ac8 100644
--- a/regression-tests/12-rpl/code/sender-node.c
+++ b/regression-tests/12-rpl/code/sender-node.c
@@ -72,7 +72,7 @@ set_global_address(void)
   int i;
   uint8_t state;
 
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ip6addr(&ipaddr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0, 0, 0, 0);
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
@@ -109,7 +109,7 @@ PROCESS_THREAD(sender_node_process, ev, data)
 
     PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
 
-    uip_ip6addr(&addr, 0xaaaa, 0, 0, 0, 0x0201, 0x001, 0x001, 0x001);
+    uip_ip6addr(&addr, UIP_DS6_DEFAULT_PREFIX, 0, 0, 0, 0x0201, 0x001, 0x001, 0x001);
 
     {
       static unsigned int message_number;
diff --git a/regression-tests/13-ipv6-apps/x02-sky-coap.csc b/regression-tests/13-ipv6-apps/x02-sky-coap.csc
index ad3155f3dce1245e62eed4ca71f5823aad33d27a..d3d284a2d8f0ba123fe7fe62d1ad8857fd8e7ecc 100644
--- a/regression-tests/13-ipv6-apps/x02-sky-coap.csc
+++ b/regression-tests/13-ipv6-apps/x02-sky-coap.csc
@@ -181,14 +181,14 @@ PROCESS_CONF_NO_PROCESS_NAMES=1
 
 The test script communicates with the REST server via the RPL border router using external commands.
 (* $ make connect-router-cooja)
-* $ ping6 -c 10 -I tun0 aaaa::212:7401:1:101
-* $ ping6 -c 10 -I tun0 aaaa::212:7402:2:202
-* $ wget -t 1 -T 10 -O - http://[aaaa::212:7402:2:202]
+* $ ping6 -c 10 -I tun0 fd00::212:7401:1:101
+* $ ping6 -c 10 -I tun0 fd00::212:7402:2:202
+* $ wget -t 1 -T 10 -O - http://[fd00::212:7402:2:202]
 
 The final test uses the CoAP Java implementation by Matthias Kovatsch, downloaded from:
 https://github.com/mkovatsc/Californium/blob/master/run/ExampleClient.jar
-* $ java -jar ExampleClient.jar DISCOVER coap://[aaaa::212:7402:2:202]
-* $ java -jar ExampleClient.jar GET coap://[aaaa::212:7402:2:202]/hello</notes>
+* $ java -jar ExampleClient.jar DISCOVER coap://[fd00::212:7402:2:202]
+* $ java -jar ExampleClient.jar GET coap://[fd00::212:7402:2:202]/hello</notes>
       <decorations>true</decorations>
     </plugin_config>
     <width>751</width>
diff --git a/tools/sky/uip6-bridge/Makefile b/tools/sky/uip6-bridge/Makefile
index 492dc9b771557363b4e9347787c4650ecc9ce48b..11fa74356332dd45a2b902cc44d94ada9b64fbd9 100644
--- a/tools/sky/uip6-bridge/Makefile
+++ b/tools/sky/uip6-bridge/Makefile
@@ -36,5 +36,5 @@ connect: ../../tapslip6
 
 bridge:
 	@sudo service radvd restart || echo radvd could not be restarted
-	sudo route add -6 aaaa::/64 tap0
-	sudo ip -6 address add aaaa::1/64 dev tap0
+	sudo route add -6 fd00::/64 tap0
+	sudo ip -6 address add fd00::1/64 dev tap0
diff --git a/tools/stm32w/wpcapslip6/README.md b/tools/stm32w/wpcapslip6/README.md
index f3c277efbc71f57e1372b2282bf7d9564bd8119d..63bb6dccdf3f20d83e6ec5186cabe29294fcc17c 100644
--- a/tools/stm32w/wpcapslip6/README.md
+++ b/tools/stm32w/wpcapslip6/README.md
@@ -14,9 +14,9 @@ rpl-border-router (the latter on Windows Vista and later only).
 
 An example of usage with the RPL border router:
 
-    wpcapslip6 -s COMXX -b aaaa:: -a aaaa:1::1/128 02-00-00-00-00-01
+    wpcapslip6 -s COMXX -b fd00:: -a fd00:1::1/128 02-00-00-00-00-01
 
 where 02-00-00-00-00-01 is the MAC address of the local network adapter.
 
--a aaaa:1::1/128 can be omitted if an IP address is already set to the network
+-a fd00:1::1/128 can be omitted if an IP address is already set to the network
 adapter.
diff --git a/tools/tunslip6.c b/tools/tunslip6.c
index 369f16ec8584f7156cba0bb10eea17c3ccbcafe0..49019a66b8bc7c9e8aab464cf2fded8b4d6b2a37 100644
--- a/tools/tunslip6.c
+++ b/tools/tunslip6.c
@@ -837,7 +837,7 @@ main(int argc, char **argv)
     case 'h':
     default:
 fprintf(stderr,"usage:  %s [options] ipaddress\n", prog);
-fprintf(stderr,"example: tunslip6 -L -v2 -s ttyUSB1 aaaa::1/64\n");
+fprintf(stderr,"example: tunslip6 -L -v2 -s ttyUSB1 fd00::1/64\n");
 fprintf(stderr,"Options are:\n");
 #ifndef __APPLE__
 fprintf(stderr," -B baudrate    9600,19200,38400,57600,115200 (default),230400,460800,921600\n");