IPv4
This section is transcluded from 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 network[3]
10.0.0.0/8 10.0.0.0–10.255.255.255 16777216 Private network Used for local communications within a private network.[4]
100.64.0.0/10 100.64.0.0–100.127.255.255 4194304 Private network Shared address space[5] 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.[3]
169.254.0.0/16 169.254.0.0–169.254.255.255 65536 Subnet Used for link-local addresses[6] 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.[4]
192.0.0.0/24 192.0.0.0–192.0.0.255 256 Private network IETF Protocol Assignments.[3]
192.0.2.0/24 192.0.2.0–192.0.2.255 256 Documentation Assigned as TEST-NET-1, documentation and examples.[7]
192.88.99.0/24 192.88.99.0–192.88.99.255 256 Internet Reserved.[8] Formerly used for IPv6 to IPv4 relay[9] (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.[4]
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.[10]
198.51.100.0/24 198.51.100.0–198.51.100.255 256 Documentation Assigned as TEST-NET-2, documentation and examples.[7]
203.0.113.0/24 203.0.113.0–203.0.113.255 256 Documentation Assigned as TEST-NET-3, documentation and examples.[7]
224.0.0.0/4 224.0.0.0–239.255.255.255 268435456 Internet In use for IP multicast.[11] (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.[11][12]
240.0.0.0/4 240.0.0.0–255.255.255.254 268435455 Internet Reserved for future use.[13] (Former Class E network.)
255.255.255.255/32 255.255.255.255 1 Subnet Reserved for the "limited broadcast" destination address.[3][14]The Bash Hackers Wiki
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