| サブネットマスク | プレフィックス | IPアドレス数 | ホストアドレス数 |
| 128.0.0.0 | /1 | 2,147,483,648 | 2,147,483,646 |
| 192.0.0.0 | /2 | 1,073,741,824 | 1,073,741,822 |
| 224.0.0.0 | /3 | 536,870,912 | 536,870,910 |
| 240.0.0.0 | /4 | 268,435,456 | 268,435,454 |
| 248.0.0.0 | /5 | 134,217,728 | 134,217,726 |
| 252.0.0.0 | /6 | 67,108,864 | 67,108,862 |
| 254.0.0.0 | /7 | 33,554,432 | 33,554,430 |
| 255.0.0.0 | /8 | 16,777,216 | 16,777,214 |
| 255.128.0.0 | /9 | 8,388,608 | 8,388,606 |
| 255.192.0.0 | /10 | 4,194,304 | 4,194,302 |
| 255.224.0.0 | /11 | 2,097,152 | 2,097,150 |
| 255.240.0.0 | /12 | 1,048,576 | 1,048,574 |
| 255.248.0.0 | /13 | 524,288 | 524,286 |
| 255.252.0.0 | /14 | 262,144 | 262,142 |
| 255.254.0.0 | /15 | 131,072 | 131,070 |
| 255.255.0.0 | /16 | 65,536 | 65,534 |
| 255.255.128.0 | /17 | 32,768 | 32,766 |
| 255.255.192.0 | /18 | 16,384 | 16,382 |
| 255.255.224.0 | /19 | 8,192 | 8,190 |
| 255.255.240.0 | /20 | 4,096 | 4,094 |
| 255.255.248.0 | /21 | 2,048 | 2,046 |
| 255.255.252.0 | /22 | 1,024 | 1,022 |
| 255.255.254.0 | /23 | 512 | 510 |
| 255.255.255.0 | /24 | 256 | 254 |
| 255.255.255.128 | /25 | 128 | 126 |
| 255.255.255.192 | /26 | 64 | 62 |
| 255.255.255.224 | /27 | 32 | 30 |
| 255.255.255.240 | /28 | 16 | 14 |
| 255.255.255.248 | /29 | 8 | 6 |
| 255.255.255.252 | /30 | 4 | 2 |
| 255.255.255.254 | /31 | 2 | – |
| 255.255.255.255 | /32 | 1 | – |
SBクリエイティブ
