Internet Assigned Numbers Authority IANA IPv4 Special-Purpose Address Registry Created 2009-08-19 Last Updated 2021-02-04 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text 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) 192.168.0.0/16 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