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Internet Protocol Version 6 Address Space

(last updated 2008-05-13)

IPv6 Prefix           Allocation              Reference      Note
-----------           ----------              ---------      ----
0000::/8              Reserved by IETF        [RFC4291]      [1] [5] 
0100::/8              Reserved by IETF        [RFC4291]
0200::/7              Reserved by IETF        [RFC4048]      [2]
0400::/6              Reserved by IETF        [RFC4291]
0800::/5              Reserved by IETF        [RFC4291]
1000::/4              Reserved by IETF        [RFC4291]
2000::/3              Global Unicast          [RFC4291]      [3]
4000::/3              Reserved by IETF        [RFC4291]
6000::/3              Reserved by IETF        [RFC4291]
8000::/3              Reserved by IETF        [RFC4291]
A000::/3              Reserved by IETF        [RFC4291]
C000::/3              Reserved by IETF        [RFC4291]
E000::/4              Reserved by IETF        [RFC4291]
F000::/5              Reserved by IETF        [RFC4291]
F800::/6              Reserved by IETF        [RFC4291]
FC00::/7              Unique Local Unicast    [RFC4193]
FE00::/9              Reserved by IETF        [RFC4291]
FE80::/10             Link Local Unicast      [RFC4291]
FEC0::/10             Reserved by IETF        [RFC3879]      [4]
FF00::/8              Multicast               [RFC4291]

Notes:

[0]  The IPv6 address management function was formally delegated to
     IANA in December 1995 [RFC1881].

[1]  The "unspecified address", the "loopback address", and the IPv6
     Addresses with Embedded IPv4 Addresses are assigned out of the
     0000::/8 address block.

[2]  0200::/7 was previously defined as an OSI NSAP-mapped prefix set
     [RFC4548]. This definition has been deprecated as of December
     2004 [RFC4048].

[3]  The IPv6 Unicast space encompasses the entire IPv6 address range
     with the exception of FF00::/8. [RFC4291] IANA unicast address
     assignments are currently limited to the IPv6 unicast address
     range of 2000::/3. IANA assignments from this block are registered
     in the IANA registry: iana-ipv6-unicast-address-assignments.

[4]  FEC0::/10 was previously defined as a Site-Local scoped address
     prefix. This definition has been deprecated as of September 2004
     [RFC3879].

[5]  0000::/96 was previously defined as the "IPv4-compatible IPv6
     address" prefix.  This definition has been deprecated by [RFC4291].


References
----------
[RFC1881]   The IAB and IESG, "IPv6 Address Allocation Management",
            RFC 1881, December 1995.

[RFC1888]   J. Bound et al, "OSI NSAPs and IPv6", RFC 1888, August 1996.


[RFC3879]   C. Huitema and B. Carpenter, "Deprecating Site Local
            Addresses", RFC 3879, September 2004.

[RFC4048]   B. Carpenter, "RFC 1888 is obsolete", RFC 4048, April 2005.

[RFC4147]   G. Huston, "Proposed changes to the format of the IANA IPv6 
            Registry", RFC 4147, August 2005.

[RFC4193]   R. Hinden and B. Haberman, "Unique Local IPv6 Unicast Addresses"
            RFC 4193, October 2005.

[RFC4291]   R. Hinden, Nokia, "IP Version 6 Addressing Architecture", 
            RFC 4291, February 2006.

[RFC4548]   E. Gray, J. Rutemiller and G. Swallow, "Internet Code Point 
            Assignments for NSAP Addresses", RFC 4548, May 2006.

[]