IANA IPv4 Special-Purpose Address Registry Internet Protocol version 4 (IPv4) Address Space 2009-08-19 2020-09-04 IANA IPv4 Special-Purpose Address Registry IETF Review 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.
0.0.0.0/8
"This host on this network" , Section 3.2.1.3 1981-09 True False False False True
10.0.0.0/8
Private-Use 1996-02 True True True False False
100.64.0.0/10
Shared Address Space 2012-04 True True True False False
127.0.0.0/8
Loopback , Section 3.2.1.3 1981-09 False False False False True
169.254.0.0/16
Link Local 2005-05 True True False False True
172.16.0.0/12
Private-Use 1996-02 True True True False False
192.0.0.0/24
IETF Protocol Assignments , Section 2.1 2010-01 False False False False False
192.0.0.0/29
IPv4 Service Continuity Prefix 2011-06 True True True False False
192.0.0.8/32
IPv4 dummy address 2015-03 True False False False False
192.0.0.9/32
Port Control Protocol Anycast 2015-10 True True True True False
192.0.0.10/32
Traversal Using Relays around NAT Anycast 2017-02 True True True True False
192.0.0.170/32, 192.0.0.171/32
NAT64/DNS64 Discovery , Section 2.2 2013-02 False False False False True
192.0.2.0/24
Documentation (TEST-NET-1) 2010-01 False False False False False
192.31.196.0/24
AS112-v4 2014-12 True True True True False
192.52.193.0/24
AMT 2014-12 True True True True False
192.88.99.0/24
Deprecated (6to4 Relay Anycast) 2001-06 2015-03
192.168.0.0/16
Private-Use 1996-02 True True True False False
192.175.48.0/24
Direct Delegation AS112 Service 1996-01 True True True True False
198.18.0.0/15
Benchmarking 1999-03 True True True False False
198.51.100.0/24
Documentation (TEST-NET-2) 2010-01 False False False False False
203.0.113.0/24
Documentation (TEST-NET-3) 2010-01 False False False False False
240.0.0.0/4
Reserved , Section 4 1989-08 False False False False True
255.255.255.255/32
Limited Broadcast , Section 7 1984-10 False True False False True Several protocols have been granted exceptions to this rule. For examples, see and . Not useable unless by virtue of a more specific reservation.