|
子网掩码 |
网络位数 | 可用主机数 |
| 255.255.255.252 | 30 | 2 |
| 255.255.255.248 | 29 | 6 |
| 255.255.255.240 | 28 | 14 |
| 255.255.255.224 | 27 | 30 |
| 255.255.255.192 | 26 | 62 |
| 255.255.255.128 | 25 | 126 |
| 255.255.255.0 | 24 | 254 |
| 255.255.254.0 | 23 | 510 |
| 255.255.252.0 | 22 | 1022 |
| 255.255.248.0 | 21 | 2046 |
| 255.255.240.0 | 20 | 4094 |
| 255.255.224.0 | 19 | 8190 |
| 255.255.192.0 | 18 | 16382 |
| 255.255.128.0 | 17 | 32766 |
| 255.255.0.0 | 16 | 65534 |