This table is the list of the RFC 1918 & 6598 non-routable addresses on the Internet
| Class |
Start |
End |
Mask |
CIDR |
CIDR Mask |
CIDR Wildcard |
| A |
10.0.0.0 |
10.255.255.255 |
255.0.0.0 |
10.0.0.0/8 |
255.0.0.0 |
0.255.255.255 |
|
100.64.0.0 |
100.127.255.255 |
255.192.0.0 |
100.64.0.0/10 |
255.192.0.0 |
0.63.255.255 |
| B |
172.16.0.0 |
172.31.255.255 |
255.240.0.0 |
172.16.0.0/12 |
255.240.0.0 |
0.15.255.255 |
| C |
192.168.0.0 |
192.168.255.0 |
255.255.255.0 |
192.168.0.0/16 |
255.255.0.0 |
0.0.255.255 |
| Some other special address ranges |
|
Windows autoconfiguration (for when the DHCP server is down) |
| B |
169.254.0.0 |
169.254.255.255 |
255.255.0.0 |
169.254.0.0/16 |
255.255.0.0 |
0.0.255.255 |
Some extra info about various CIDR blocks
This is from https://datatracker.ietf.org/doc/rfc5735/
4. Summary Table
Address Block Present Use Reference
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0.0.0.0/8 "This" Network RFC 1122, Section 3.2.1.3
10.0.0.0/8 Private-Use Networks RFC 1918
100.64.0.0/10 Shared addresses RFC 6598
127.0.0.0/8 Loopback RFC 1122, Section 3.2.1.3
169.254.0.0/16 Link Local RFC 3927
172.16.0.0/12 Private-Use Networks RFC 1918
192.0.0.0/24 IETF Protocol Assignments RFC 5736
192.0.2.0/24 TEST-NET-1 RFC 5737
192.88.99.0/24 6to4 Relay Anycast RFC 3068
192.168.0.0/16 Private-Use Networks RFC 1918
198.18.0.0/15 Network Interconnect
Device Benchmark Testing RFC 2544
198.51.100.0/24 TEST-NET-2 RFC 5737
203.0.113.0/24 TEST-NET-3 RFC 5737
224.0.0.0/4 Multicast RFC 3171
240.0.0.0/4 Reserved for Future Use RFC 1112, Section 4
255.255.255.255/32 Limited Broadcast RFC 919, Section 7
RFC 922, Section 7