CIDR notation specifies an IP address and its routing prefix. For example, 192.168.1.0/24 represents a network with 256 addresses.
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| CIDR | Subnet Mask | Usable Hosts |
|---|---|---|
/8 |
255.0.0.0 |
16,777,214 |
/12 |
255.240.0.0 |
1,048,574 |
/16 |
255.255.0.0 |
65,534 |
/20 |
255.255.240.0 |
4,094 |
/24 |
255.255.255.0 |
254 |
/25 |
255.255.255.128 |
126 |
/26 |
255.255.255.192 |
62 |
/27 |
255.255.255.224 |
30 |
/28 |
255.255.255.240 |
14 |
/29 |
255.255.255.248 |
6 |
/30 |
255.255.255.252 |
2 |
/31 |
255.255.255.254 |
2 (point-to-point) |
/32 |
255.255.255.255 |
1 |
| Class | Range | CIDR |
|---|---|---|
| A | 10.0.0.0 - 10.255.255.255 | 10.0.0.0/8 |
| B | 172.16.0.0 - 172.31.255.255 | 172.16.0.0/12 |
| C | 192.168.0.0 - 192.168.255.255 | 192.168.0.0/16 |