Reserved IP addresses
From 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.
Contents
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 |
268,435,455 | Internet | Reserved for muticast[10] |
| 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 |
