Reserved IP addresses

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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.

IPv4[edit]

Address block (CIDR) Range Number of addresses Scope Purpose
0.0.0.0/8 0.0.0.0 –
0.255.255.255
16,777,216 Software Used for broadcast messages to the current ("this")[1]
10.0.0.0/8 10.0.0.0 –
10.255.255.255
16,777,216 Private network Used for local communications within a private network[2]
100.64.0.0/10 100.64.0.0 –
100.127.255.255
4,194,304 Private network Used for communications between a service provider and its subscribers when using a carrier-grade NAT[3]
127.0.0.0/8 127.0.0.0 –
127.255.255.255
16,777,216 Host Used for loopback addresses to the local host[4]
169.254.0.0/16 169.254.0.0 –
169.254.255.255
65,536 Subnet Used for link-local addresses between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server[5]
172.16.0.0/12 172.16.0.0 –
172.31.255.255
1,048,576 Private network Used for local communications within a private network[2]
192.0.0.0/24 192.0.0.0 –
192.0.0.255
256 Private network Used for the IANA IPv4 Special Purpose Address Registry[6]
192.0.2.0/24 192.0.2.0 –
192.0.2.255
256 Documentation Assigned as "TEST-NET" for use in documentation and examples. It should not be used publicly.[7]
192.88.99.0/24 192.88.99.0 –
192.88.99.255
256 Internet Used by 6to4 anycast relays[8]
192.168.0.0/16 192.168.0.0 –
192.168.255.255
65,536 Private network Used for local communications within a private network[2]
198.18.0.0/15 198.18.0.0 –
198.19.255.255
131,072 Private network Used for 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" for use in documentation and examples. It should not be used publicly.[7]
203.0.113.0/24 203.0.113.0 –
203.0.113.255
256 Documentation Assigned as "TEST-NET-3" for use in documentation and examples. It should not be used publicly.[7]
224.0.0.0/4 224.0.0.0 –
239.255.255.255
268,435,456 Internet Reserved for multicast assignments[10]

233.252.0.0/24 is assigned as "MCAST-TEST-NET" for use in documentation and examples.

240.0.0.0/4 240.0.0.0 –
255.255.255.254
268,435,455 Internet Reserved for future use[11]
255.255.255.255/32 255.255.255.255 1 Subnet Reserved for the "limited broadcast" destination address[11]

IPv6[edit]

Address block (CIDR) Range Number of addresses Scope Purpose
::/128 :: 1 Software Unspecified address
::1/128 ::1 1 Host Loopback address to the local host.
::ffff:0:0/96 ::ffff:0.0.0.0 –
::ffff:255.255.255.255
232 Software IPv4 mapped addresses
100::/64 100:: –
100::ffff:ffff:ffff:ffff
264 Discard prefix RFC 6666
64:ff9b::/96 64:ff9b::0.0.0.0 –
64:ff9b::255.255.255.255
232 Global Internet[12] IPv4/IPv6 translation (RFC 6052)
2001::/32 2001:: –
2001::ffff:ffff:ffff:ffff:ffff:ffff
296 Global Teredo tunneling
2001:10::/28 2001:10:: –
2001:1f:ffff:ffff:ffff:ffff:ffff:ffff
2100 Software Deprecated (previously ORCHID)
2001:20::/28 2001:20:: –
2001:2f:ffff:ffff:ffff:ffff:ffff:ffff
2100 Software ORCHIDv2
2001:db8::/32 2001:db8:: –
2001:db8:ffff:ffff:ffff:ffff:ffff:ffff
296 Documentation Addresses used in documentation and example source code
2002::/16 2002:: –
2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff
2112 Global Internet 6to4
fc00::/7 fc00:: –
fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
2121 Private network Unique local address
fe80::/10 fe80:: –
febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
2118 Link Link-local address
ff00::/8 ff00:: –
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
2120 Global Internet Multicast address

See also[edit]

References[edit]

  1. ^ RFC 1700, Assigned Numbers (1994), page 4
  2. ^ a b c RFC 1918, Address Allocation for Private Internets (1996)
  3. ^ RFC 6598, IANA-Reserved IPv4 Prefix for Shared Address Space (2012)
  4. ^ RFC 990, Assigned Numbers (1986)
  5. ^ RFC 3927, Dynamic Configuration of IPv4 Link-Local Addresses (2005)
  6. ^ RFC 5736, IANA IPv4 Special Purpose Address Registry (2010)
  7. ^ a b c RFC 5737, IPv4 Address Blocks Reserved for Documentation (2010)
  8. ^ RFC 3068, An Anycast Prefix for 6to4 Relay Routers (2001)
  9. ^ RFC 2544, Benchmarking Methodology for Network Interconnect Devices (1999)
  10. ^ RFC 5771, IANA Guidelines for IPv4 Multicast Address Assignments (2010)
  11. ^ a b RFC 6890, Special-Purpose IP Address Registries (2013)
  12. ^ RFC 6052 section 3.2

External links[edit]