Reserved IPv4 Addresses
| CIDR | Address Range | Number of Addresses | Routed on the public Internet | Purpose |
|---|---|---|---|---|
| 0.0.0.0/8 | 0.0.0.0 – 0.255.255.255 |
16777216 | No | Used for broadcast messages to the current ("this") network as specified by RFC 1700, page 4. |
| 10.0.0.0/8 | 10.0.0.0 – 10.255.255.255 |
16777216 | No | Used for local communications within a private network as specified by RFC 1918. |
| 100.64.0.0/10 | 100.64.0.0 – 100.127.255.255 |
4194304 | No | Used for communications between a Service Provider and its subscribers when using a Carrier-grade NAT, as specified by RFC 6598. |
| 127.0.0.0/8 | 127.0.0.0 – 127.255.255.255 |
16777216 | No | Used for loopback addresses to the local host, as specified by RFC 5735. |
| 169.254.0.0/16 | 169.254.0.0 – 169.254.255.255 |
65536 | No | Used for autoconfiguration 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, as specified by RFC 5735. |
| 172.16.0.0/12 | 172.16.0.0 – 172.31.255.255 |
1048576 | No | Used for local communications within a private network as specified by RFC 1918 |
| 192.0.0.0/29 | 192.0.0.0 – 192.0.0.7 |
8 | No | Used for the DS-Lite transition mechanism as specified by RFC 6333 |
| 192.0.2.0/24 | 192.0.2.0 – 192.0.2.255 |
256 | No | Assigned as "TEST-NET" in RFC 5737 for use solely in documentation and example source code and should not be used publicly. |
| 192.88.99.0/24 | 192.88.99.0 – 192.88.99.255 |
256 | Yes | Used by 6to4 anycast relays as specified by RFC 3068. |
| 192.168.0.0/16 | 192.168.0.0 – 192.168.255.255 |
65536 | No | Used for local communications within a private network as specified by RFC 1918. |
| 198.18.0.0/15 | 198.18.0.0 – 198.19.255.255 |
131072 | No | Used for testing of inter-network communications between two separate subnets as specified in RFC 2544. |
| 198.51.100.0/24 | 198.51.100.0 – 198.51.100.255 |
256 | No | Assigned as "TEST-NET-2" in RFC 5737 for use solely in documentation and example source code and should not be used publicly. |
| 203.0.113.0/24 | 203.0.113.0 – 203.0.113.255 |
256 | No | Assigned as "TEST-NET-3" in RFC 5737 for use solely in documentation and example source code and should not be used publicly. |
| 224.0.0.0/4 | 224.0.0.0 – 239.255.255.255 |
268435456 | Yes | Reserved for multicast assignments as specified in RFC 5771 |
| 240.0.0.0/4 | 240.0.0.0 – 255.255.255.254 |
268435455 | No | Reserved for future use, as specified by RFC 5735. |
| 255.255.255.255/32 | 255.255.255.255 | 1 | No | Reserved for the "limited broadcast" destination address, as specified by RFC 5735. |
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