IANA IPv6 Special-Purpose Address Registry

Created: 2006-01-10
Last Updated: 2024-10-22
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Registry included below

IANA IPv6 Special-Purpose Address Registry

IANA IPv6 Special-Purpose Address Registry

Registration Procedure(s)

IETF Review

Reference

[RFC4773][RFC6890][RFC8190]

Note

Address prefixes listed in the Special-Purpose Address Registry are
not guaranteed routability in any particular local or global context.

The IPv4 and IPv6 Special-Purpose Address Registries maintain the following 
information regarding each entry:

   o  Address Block - A block of IPv4 or IPv6 addresses that has been
      registered for a special purpose.

   o  Name - A descriptive name for the special-purpose address block.

   o  RFC - The RFC through which the special-purpose address block was
      requested.

   o  Allocation Date - The date upon which the special-purpose address
      block was allocated.

   o  Termination Date - The date upon which the allocation is to be
      terminated.  This field is applicable for limited-use allocations
      only.

   o  Source - A boolean value indicating whether an address from the
      allocated special-purpose address block is valid when used as the
      source address of an IP datagram that transits two devices.

   o  Destination - A boolean value indicating whether an address from
      the allocated special-purpose address block is valid when used as
      the destination address of an IP datagram that transits two
      devices.

   o  Forwardable - A boolean value indicating whether a router may
      forward an IP datagram whose destination address is drawn from the
      allocated special-purpose address block between external
      interfaces.

   o  Globally Reachable - A boolean value indicating whether an IP 
      datagram whose destination address is drawn from the allocated 
      special-purpose address block is forwardable beyond a specified 
      administrative domain.

   o  Reserved-by-Protocol - A boolean value indicating whether the
      special-purpose address block is reserved by IP, itself.  This
      value is "TRUE" if the RFC that created the special-purpose
      address block requires all compliant IP implementations to behave
      in a special way when processing packets either to or from
      addresses contained by the address block.

If the value of "Destination" is FALSE, the values of "Forwardable" and 
"Globally Reachable" must also be false.

Available Formats

CSV

Address Block	Name	RFC	Allocation Date	Termination Date	Source	Destination	Forwardable	Globally Reachable	Reserved-by-Protocol
::1/128	Loopback Address	[RFC4291]	2006-02	N/A	False	False	False	False	True
::/128	Unspecified Address	[RFC4291]	2006-02	N/A	True	False	False	False	True
::ffff:0:0/96	IPv4-mapped Address	[RFC4291]	2006-02	N/A	False	False	False	False	True
64:ff9b::/96	IPv4-IPv6 Translat.	[RFC6052]	2010-10	N/A	True	True	True	True	False
64:ff9b:1::/48	IPv4-IPv6 Translat.	[RFC8215]	2017-06	N/A	True	True	True	False	False
100::/64	Discard-Only Address Block	[RFC6666]	2012-06	N/A	True	True	True	False	False
2001::/23	IETF Protocol Assignments	[RFC2928]	2000-09	N/A	False [1]	False [1]	False [1]	False [1]	False
2001::/32	TEREDO	[RFC4380] [RFC8190]	2006-01	N/A	True	True	True	N/A [2]	False
2001:1::1/128	Port Control Protocol Anycast	[RFC7723]	2015-10	N/A	True	True	True	True	False
2001:1::2/128	Traversal Using Relays around NAT Anycast	[RFC8155]	2017-02	N/A	True	True	True	True	False
2001:1::3/128	DNS-SD Service Registration Protocol Anycast	[RFC-ietf-dnssd-srp-25]	2024-04	N/A	True	True	True	True	False
2001:2::/48	Benchmarking	[RFC5180][RFC Errata 1752]	2008-04	N/A	True	True	True	False	False
2001:3::/32	AMT	[RFC7450]	2014-12	N/A	True	True	True	True	False
2001:4:112::/48	AS112-v6	[RFC7535]	2014-12	N/A	True	True	True	True	False
2001:10::/28	Deprecated (previously ORCHID)	[RFC4843]	2007-03	2014-03
2001:20::/28	ORCHIDv2	[RFC7343]	2014-07	N/A	True	True	True	True	False
2001:30::/28	Drone Remote ID Protocol Entity Tags (DETs) Prefix	[RFC9374]	2022-12	N/A	True	True	True	True	False
2001:db8::/32	Documentation	[RFC3849]	2004-07	N/A	False	False	False	False	False
2002::/16 [3]	6to4	[RFC3056]	2001-02	N/A	True	True	True	N/A [3]	False
2620:4f:8000::/48	Direct Delegation AS112 Service	[RFC7534]	2011-05	N/A	True	True	True	True	False
3fff::/20	Documentation	[RFC9637]	2024-07	N/A	False	False	False	False	False
5f00::/16	Segment Routing (SRv6) SIDs	[RFC9602]	2024-04	N/A	True	True	True	False	False
fc00::/7	Unique-Local	[RFC4193] [RFC8190]	2005-10	N/A	True	True	True	False [4]	False
fe80::/10	Link-Local Unicast	[RFC4291]	2006-02	N/A	True	True	False	False	True

Footnotes

[1]	Unless allowed by a more specific allocation.
[2]	See Section 5 of [RFC4380] for details.
[3]	See [RFC3056] for details.
[4]	See [RFC4193] for more details on the routability of Unique-Local addresses. The Unique-Local prefix is drawn from the IPv6 Global Unicast Address range, but is specified as not globally routed.