2012-05-30 The allocation of Internet Protocol version 6 (IPv6) unicast address space is listed here. References to the various other registries detailing the use of the IPv6 address space can be found in the IPv6 Address Space registry. The assignable Global Unicast Address space is defined in as being the address block defined by the prefix 2000::/3. All address space in this block not listed in the table below is reserved by IANA for future allocation. 2001:0000::/23 IANA whois.iana.org ALLOCATED 2001:0200::/23 APNIC whois.apnic.net ALLOCATED 2001:0400::/23 ARIN whois.arin.net ALLOCATED 2001:0600::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:0800::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:0A00::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:0C00::/23 APNIC whois.apnic.net ALLOCATED 2001:0E00::/23 APNIC whois.apnic.net ALLOCATED 2001:1200::/23 LACNIC whois.lacnic.net ALLOCATED 2001:1400::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:1600::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:1800::/23 ARIN whois.arin.net ALLOCATED 2001:1A00::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:1C00::/22 RIPE NCC whois.ripe.net ALLOCATED 2001:2000::/20 RIPE NCC whois.ripe.net ALLOCATED 2001:3000::/21 RIPE NCC whois.ripe.net ALLOCATED 2001:3800::/22 RIPE NCC whois.ripe.net ALLOCATED 2001:3C00::/22 IANA RESERVED 2001:4000::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:4200::/23 AfriNIC whois.afrinic.net ALLOCATED 2001:4400::/23 APNIC whois.apnic.net ALLOCATED 2001:4600::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:4800::/23 ARIN whois.arin.net ALLOCATED 2001:4A00::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:4C00::/23 RIPE NCC whois.ripe.net ALLOCATED 2001:5000::/20 RIPE NCC whois.ripe.net ALLOCATED 2001:8000::/19 APNIC whois.apnic.net ALLOCATED 2001:A000::/20 APNIC whois.apnic.net ALLOCATED 2001:B000::/20 APNIC whois.apnic.net ALLOCATED 2002:0000::/16 6to4 ALLOCATED 2003:0000::/18 RIPE NCC whois.ripe.net ALLOCATED 2400:0000::/12 APNIC whois.apnic.net ALLOCATED 2600:0000::/12 ARIN whois.arin.net ALLOCATED 2610:0000::/23 ARIN whois.arin.net ALLOCATED 2620:0000::/23 ARIN whois.arin.net ALLOCATED 2800:0000::/12 LACNIC whois.lacnic.net ALLOCATED 2A00:0000::/12 RIPE NCC whois.ripe.net ALLOCATED 2C00:0000::/12 AfriNIC whois.afrinic.net ALLOCATED 2D00:0000::/8 IANA RESERVED 2E00:0000::/7 IANA RESERVED 3000:0000::/4 IANA RESERVED 3ffe::/16 IANA RESERVED 5f00::/8 IANA RESERVED IANA Special Purpose Address Block . See: 2001:0DB8::/32 has been assigned as a NON-ROUTABLE range to be used for documentation purpose . 2001:3C00::/22 is reserved for possible future allocation to the RIPE NCC. 2002::/16 is reserved for use in 6to4 deployments . 2A00:0000::/21 was originally allocated on 2005-04-19. 2A01:0000::/23 was allocated on 2005-07-14. 2A01:0000::/16 (incorporating the 2A01:0000::/23) was allocated 2005-12-15. The more recent allocation (2006-10-03) incorporates these previous allocations. 2800:0000::/23 was allocated on 17 Nov 05. The more recent allocation (2006-10-03) incorporates the previous allocation. 2400:0000::/19 was allocated on 2005-05-20. 2400:2000::/19 was allocated on 2005-07-08. 2400:4000::/21 was allocated on 2005-08-08. 2404:0000::/23 was allocated on 2006-01-19. The more recent allocation (2006-10-03) incorporates all these previous allocations. 2600:0000::/22, 2604:0000::/22, 2608:0000::/22 and 260C:0000::/22 were allocated on 2005-04-19. The more recent allocation (2006-10-03) incorporates all these previous allocations. 3FFE:831F::/32 was used for Teredo in some old but widely distributed networking stacks. This usage is deprecated in favour of 2001::/32, which was allocated for the purpose in 3ffe::/16 was used for the 6bone but was returned. 5f00::/8 was used for the 6bone but was returned.