IANA IPv4 Special-Purpose Address Registry

Registration Procedure(s)

IETF Review

Reference[RFC5736][RFC6890][RFC8190]Note

The IETF has reserved the address block of 192.0.0.0/24 for use for
special purposes relating to protocol assignments. This registry
contains the current assignments made by the IETF from this address
block.

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
0.0.0.0/8	“This host on this network”	[RFC1122], Section 3.2.1.3	1981-09	N/A	True	False	False	False	True
10.0.0.0/8	Private-Use	[RFC1918]	1996-02	N/A	True	True	True	False	False
100.64.0.0/10	Shared Address Space	[RFC6598]	2012-04	N/A	True	True	True	False	False
127.0.0.0/8	Loopback	[RFC1122], Section 3.2.1.3	1981-09	N/A	False [1]	False [1]	False [1]	False [1]	True
169.254.0.0/16	Link Local	[RFC3927]	2005-05	N/A	True	True	False	False	True
172.16.0.0/12	Private-Use	[RFC1918]	1996-02	N/A	True	True	True	False	False
192.0.0.0/24 [2]	IETF Protocol Assignments	[RFC6890], Section 2.1	2010-01	N/A	False	False	False	False	False
192.0.0.0/29	IPv4 Service Continuity Prefix	[RFC7335]	2011-06	N/A	True	True	True	False	False
192.0.0.8/32	IPv4 dummy address	[RFC7600]	2015-03	N/A	True	False	False	False	False
192.0.0.9/32	Port Control Protocol Anycast	[RFC7723]	2015-10	N/A	True	True	True	True	False
192.0.0.10/32	Traversal Using Relays around NAT Anycast	[RFC8155]	2017-02	N/A	True	True	True	True	False
192.0.0.170/32, 192.0.0.171/32	NAT64/DNS64 Discovery	[RFC-cheshire-sudn-ipv4only-dot-arpa-17][RFC7050], Section 2.2	2013-02	N/A	False	False	False	False	True
192.0.2.0/24	Documentation (TEST-NET-1)	[RFC5737]	2010-01	N/A	False	False	False	False	False
192.31.196.0/24	AS112-v4	[RFC7535]	2014-12	N/A	True	True	True	True	False
192.52.193.0/24	AMT	[RFC7450]	2014-12	N/A	True	True	True	True	False
192.88.99.0/24	Deprecated (6to4 Relay Anycast)	[RFC7526]	2001-06	2015-03
192.168.0.0/16	Private-Use	[RFC1918]	1996-02	N/A	True	True	True	False	False
192.175.48.0/24	Direct Delegation AS112 Service	[RFC7534]	1996-01	N/A	True	True	True	True	False
198.18.0.0/15	Benchmarking	[RFC2544]	1999-03	N/A	True	True	True	False	False
198.51.100.0/24	Documentation (TEST-NET-2)	[RFC5737]	2010-01	N/A	False	False	False	False	False
203.0.113.0/24	Documentation (TEST-NET-3)	[RFC5737]	2010-01	N/A	False	False	False	False	False
240.0.0.0/4	Reserved	[RFC1112], Section 4	1989-08	N/A	False	False	False	False	True
255.255.255.255/32	Limited Broadcast	[RFC8190] [RFC919], Section 7	1984-10	N/A	False	True	False	False	True

Footnotes

[1]	Several protocols have been granted exceptions to this rule. For examples, see [RFC8029] and [RFC5884].
[2]	Not useable unless by virtue of a more specific reservation.