Reserved IP addresses

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]

[1]

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 link-local addresses^[5] 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
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 (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]

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:0:0	::ffff:255.255.255.255 ::ffff:ffff:ffff	2³²	Software	IPv4-mapped addresses
::ffff:0:0:0/96	::ffff:0:0.0.0.0 ::ffff:0:0:0	::ffff:0:255.255.255.255 ::ffff:0:ffff:ffff	2³²	Software	IPv4-translated addresses
64:ff9b::/96	64:ff9b::0.0.0.0 64:ff9b::0:0	64:ff9b::255.255.255.255 64:ff9b::ffff:ffff	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::	2001:0: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
3fff::/20	3fff::	3fff:fff:ffff:ffff:ffff:ffff:ffff:ffff	2¹⁰⁸	Documentation	Addresses used in documentation and example source code^[19]
5f00::/16	5f00::	5f00:ffff:ffff:ffff:ffff:ffff:ffff:ffff	2¹¹²	Routing	IPv6 Segment Routing (SRv6)^[20]
fc00::/7	fc00::	fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff	2¹²¹	Private internets	Unique local address^[21]
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

Reserved IP addresses

IPv4

IPv6

See also

References

External links

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