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[RFC4048] B. Carpenter, "RFC 1888 is obsolete", RFC 4048, April 2005.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