Reserved IP addresses

Source: Wikipedia, the free encyclopedia.

In the Internet addressing architecture, the Internet Engineering Task Force (IETF) and the Internet Assigned Numbers Authority (IANA) have reserved various Internet Protocol (IP) addresses for special purposes.[1]

IPv4

This section is
IPv4#Special-use addresses. (edit | history
)

IPv4 designates special usage or applications for various addresses or address blocks:[1][2]

Special address blocks
Address block Address range Number of addresses Scope Description
0.0.0.0/8 0.0.0.0–0.255.255.255 16777216 Software Current (local, "this") network[1]
10.0.0.0/8 10.0.0.0–10.255.255.255 16777216 Private network Used for local communications within a private network[3]
100.64.0.0/10 100.64.0.0–100.127.255.255 4194304 Private network Shared address space[4] for communications between a service provider and its subscribers when using a carrier-grade NAT
127.0.0.0/8 127.0.0.0–127.255.255.255 16777216 Host Used for
loopback addresses to the local host[1]
169.254.0.0/16 169.254.0.0–169.254.255.255 65536 Subnet Used for
DHCP
server
172.16.0.0/12 172.16.0.0–172.31.255.255 1048576 Private network Used for local communications within a private network[3]
192.0.0.0/24 192.0.0.0–192.0.0.255 256 Private network IETF Protocol Assignments,
DS-Lite (/29)[1]
192.0.2.0/24 192.0.2.0–192.0.2.255 256 Documentation Assigned as TEST-NET-1, documentation and examples[6]
192.88.99.0/24 192.88.99.0–192.88.99.255 256 Internet Reserved.[7] Formerly used for IPv6 to IPv4 relay[8] (included IPv6 address block 2002::/16).
192.168.0.0/16 192.168.0.0–192.168.255.255 65536 Private network Used for local communications within a private network[3]
198.18.0.0/15 198.18.0.0–198.19.255.255 131072 Private network Used for benchmark testing of inter-network communications between two separate subnets[9]
198.51.100.0/24 198.51.100.0–198.51.100.255 256 Documentation Assigned as TEST-NET-2, documentation and examples[6]
203.0.113.0/24 203.0.113.0–203.0.113.255 256 Documentation Assigned as TEST-NET-3, documentation and examples[6]
224.0.0.0/4 224.0.0.0–239.255.255.255 268435456 Internet In use for multicast[10] (former Class D network)
233.252.0.0/24 233.252.0.0–233.252.0.255 256 Documentation Assigned as MCAST-TEST-NET, documentation and examples (Note that this is part of the above multicast space.)[10][11]
240.0.0.0/4 240.0.0.0–255.255.255.254 268435455 Internet Reserved for future use[12] (former Class E network)
255.255.255.255/32 255.255.255.255 1 Subnet Reserved for the "limited broadcast" destination address[1]

IPv6

This section is transcluded from IPv6 address#Special addresses. (edit | history)

IPv6 assigns special uses or applications for various IP addresses:[1]

Special address blocks
Address block (CIDR) First address Last address Number of addresses Usage Purpose
::/128 :: :: 1 Software Unspecified address
::1/128 ::1 ::1 1 Host
Loopback address
—a virtual interface that loops all traffic back to itself, the local host
::ffff:0:0/96 ::ffff:0.0.0.0 ::ffff:255.255.255.255 232 Software IPv4-mapped addresses
::ffff:0:0:0/96 ::ffff:0:0.0.0.0 ::ffff:0:255.255.255.255 232 Software IPv4 translated addresses
64:ff9b::/96 64:ff9b::0.0.0.0 64:ff9b::255.255.255.255 232 The global Internet IPv4/IPv6 translation[13]
64:ff9b:1::/48 64:ff9b:1:: 64:ff9b:1:ffff:ffff:ffff:ffff:ffff 280, with 248 for each IPv4 Private internets IPv4/IPv6 translation[14]
100::/64 100:: 100::ffff:ffff:ffff:ffff 264 Routing Discard prefix[15]
2001::/32 2001:: 2001::ffff:ffff:ffff:ffff:ffff:ffff 296 The global Internet Teredo tunneling[16]
2001:20::/28 2001:20:: 2001:2f:ffff:ffff:ffff:ffff:ffff:ffff 2100 Software ORCHIDv2[17]
2001:db8::/32 2001:db8:: 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff 296 Documentation Addresses used in documentation and example source code[18]
2002::/16 2002:: 2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff 2112 The global Internet The 6to4 addressing scheme (deprecated)[7]
fc00::/7 fc00:: fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 2121 Private internets Unique local address[19]
fe80::/64 from fe80::/10 fe80:: fe80::ffff:ffff:ffff:ffff 264 Link Link-local address
ff00::/8 ff00:: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 2120 The global Internet Multicast address

See also

References

  1. ^
    ISSN 2070-1721. BCP 153. RFC 6890. Best Common Practice. Obsoletes RFC 4773, 5156, 5735 and 5736. Updated by RFC 8190
    .
  2. IANA
    . 19 August 2009.
  3. ^
    doi:10.17487/RFC1918. BCP 5. RFC 1918. Best Common Practice. Obsoletes RFC 1627 and 1597. Updated by RFC 6761
    .
  4. ISSN 2070-1721. BCP 153. RFC 6598. Best Common Practice. Updates RFC 5735
    .
  5. doi:10.17487/RFC3927. RFC 3927
    . Proposed Standard.
  6. ^
    ISSN 2070-1721. RFC 5737. Informational. Updates RFC 1166
    .
  7. ^
    doi:10.17487/RFC7526. BCP 196. RFC 7526. Best Current Practice. Obsoletes RFC 3068 and 6732
    .
  8. doi:10.17487/RFC3068. RFC 3068. Informational. Obsoleted by RFC 7526
    .
  9. doi:10.17487/RFC2544. RFC 2544. Informational. Updated by: RFC 6201 and RFC 6815
    .
  10. ^
    ISSN 2070-1721. BCP 51. RFC 5771. Best Common Practice. Obsoletes RFC 3138 and 3171. Updates RFC 2780
    .
  11. ISSN 2070-1721. RFC 6676
    . Informational.
  12. doi:10.17487/RFC3232. RFC 3232. Informational. Obsoletes RFC 1700
    .
  13. ISSN 2070-1721. RFC 6052. Proposed Standard. Updates RFC 4291
    .
  14. doi:10.17487/RFC8215. RFC 8215
    . Proposed Standard.
  15. ISSN 2070-1721. RFC 6666
    . Informational.
  16. doi:10.17487/RFC4680. RFC 4680. Proposed Standard. Updates RFC 4346. Updated by RFC 8447 and 8996
    .
  17. ISSN 2070-1721. RFC 7343. Proposed Standard. Obsoletes RFC 4843
    .
  18. doi:10.17487/RFC3849. RFC 3849
    . Informational.
  19. doi:10.17487/RFC4193. RFC 4193
    . Proposed Standard.

External links
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