Internet Assigned Numbers Authority
IANA IPv4 Special-Purpose Address Registry
Created
2009-08-19
Last Updated
2025-06-26
Available Formats
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Registry Included Below
??IANA IPv4 Special-Purpose Address Registry
IANA IPv4 Special-Purpose Address Registry
Registration Procedure(s)
IETF Review
Reference
[RFC5736][RFC6890][RFC Errata 6404][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
[IMG]
CSV
Address Block Name RFC Allocation Termination Source Destination Forwardable Globally Reserved-by-Protocol
Date Date Reachable
0.0.0.0/8 "This network" [RFC791], Section 1981-09 N/A True False False False True
3.2
0.0.0.0/32 "This host on this [RFC1122], Section 1981-09 N/A True False False False True
network" 3.2.1.3
10.0.0.0/8 Private-Use [RFC1918] 1996-02 N/A True True True False False
100.64.0.0/10 Shared Address [RFC6598] 2012-04 N/A True True True False False
Space
127.0.0.0/8 Loopback [RFC1122], Section 1981-09 N/A False False [1] False [1] False [1] True
3.2.1.3 [1]
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 [RFC6890], Section 2010-01 N/A False False False False False
Assignments 2.1
192.0.0.0/29 IPv4 Service [RFC7335] 2011-06 N/A True True True False False
Continuity Prefix
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 [RFC7723] 2015-10 N/A True True True True False
Protocol Anycast
Traversal Using
192.0.0.10/32 Relays around NAT [RFC8155] 2017-02 N/A True True True True False
Anycast
192.0.0.170/32, NAT64/DNS64 [RFC8880][RFC7050], 2013-02 N/A False False False False True
192.0.0.171/32 Discovery Section 2.2
192.0.2.0/24 Documentation [RFC5737] 2010-01 N/A False False False False False
(TEST-NET-1)
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 [RFC7526] 2001-06 2015-03
Relay Anycast)
192.88.99.2/32 6a44-relay anycast [RFC6751] 2012-10 N/A True True True False False
address
192.168.0.0/16 Private-Use [RFC1918] 1996-02 N/A True True True False False
192.175.48.0/24 Direct Delegation [RFC7534] 1996-01 N/A True True True True False
AS112 Service
198.18.0.0/15 Benchmarking [RFC2544] 1999-03 N/A True True True False False
198.51.100.0/24 Documentation [RFC5737] 2010-01 N/A False False False False False
(TEST-NET-2)
203.0.113.0/24 Documentation [RFC5737] 2010-01 N/A False False False False False
(TEST-NET-3)
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], 1984-10 N/A False True False False True
Section 7
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.
Licensing Terms
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