CIDR 対応表 †
CIDR | MASK | | | | | HOST数 |
/0 | 0.0.0.0 | 256 | 256 | 256 | 256 | 4,294,967,296 |
/1 | 128.0.0.0 | 128 | 256 | 256 | 256 | 2,147,483,648 |
/2 | 192.0.0.0 | 64 | 256 | 256 | 256 | 1,073,741,824 |
/3 | 224.0.0.0 | 32 | 256 | 256 | 256 | 536,870,912 |
/4 | 240.0.0.0 | 16 | 256 | 256 | 256 | 268,435,456 |
/5 | 248.0.0.0 | 8 | 256 | 256 | 256 | 134,217,728 |
/6 | 252.0.0.0 | 4 | 256 | 256 | 256 | 67,108,864 |
/7 | 254.0.0.0 | 2 | 256 | 256 | 256 | 33,554,432 |
/8 | 255.0.0.0 | 1 | 256 | 256 | 256 | 16,777,216 |
/9 | 255.128.0.0 | | 128 | 256 | 256 | 8,388,608 |
/10 | 255.192.0.0 | | 64 | 256 | 256 | 4,194,304 |
/11 | 255.224.0.0 | | 32 | 256 | 256 | 2,097,152 |
/12 | 255.240.0.0 | | 16 | 256 | 256 | 1,048,576 |
/13 | 255.248.0.0 | | 8 | 256 | 256 | 524,288 |
/14 | 255.252.0.0 | | 4 | 256 | 256 | 262,144 |
/15 | 255.254.0.0 | | 2 | 256 | 256 | 131,072 |
/16 | 255.255.0.0 | | 1 | 256 | 256 | 65,536 |
/17 | 255.255.128.0 | | | 128 | 256 | 32,768 |
/18 | 255.255.192.0 | | | 64 | 256 | 16,384 |
/19 | 255.255.224.0 | | | 32 | 256 | 8,192 |
/20 | 255.255.240.0 | | | 16 | 256 | 4,096 |
/21 | 255.255.248.0 | | | 8 | 256 | 2,048 |
/22 | 255.255.252.0 | | | 4 | 256 | 1,024 |
/23 | 255.255.254.0 | | | 2 | 256 | 512 |
/24 | 255.255.255.0 | | | 1 | 256 | 256 |
/25 | 255.255.255.128 | | | | 128 | 128 |
/26 | 255.255.255.192 | | | | 64 | 64 |
/27 | 255.255.255.224 | | | | 32 | 32 |
/28 | 255.255.255.240 | | | | 16 | 16 |
/29 | 255.255.255.248 | | | | 8 | 8 |
/30 | 255.255.255.252 | | | | 4 | 4 |
/31 | 255.255.255.254 | | | | 2 | 2 |
/32 | 255.255.255.255 | | | | 1 | 1 |