Netmask | Address Prefix Length | Hosts / Class C's / Class B's / Class A's |
255.255.255.255 | /32 | 1 |
255.255.255.254 | /31 | 2 |
255.255.255.252 | /30 | 4 |
255.255.255.248 | /29 | 8 |
255.255.255.240 | /28 | 16 |
255.255.255.224 | /27 | 32 |
255.255.255.192 | /26 | 64 |
255.255.255.128 | /25 | 128 |
255.255.255.0 | /24 (Class C) | 256 / 1 |
255.255.254.0 | /23 | 512 / 2 |
255.255.252.0 | /22 | 1,024 / 4 |
255.255.248.0 | /21 | 2,048 / 8 |
255.255.240.0 | /20 | 4,096 / 16 |
255.255.224.0 | /19 | 8,192 / 32 |
255.255.192.0 | /18 | 16,384 / 64 |
255.255.128.0 | /17 | 32,768 / 128 |
255.255.0.0 | /16 (Class B) | 65,536 / 256 / 1 |
255.254.0.0 | /15 | 131,072 / 512 / 2 |
255.252.0.0 | /14 | 262,144 / 1024 / 4 |
255.248.0.0 | /13 | 524,288 / 2048 / 8 |
255.240.0.0 | /12 | 1,048,576 / 4096 / 16 |
255.224.0.0 | /11 | 2,097,152 / 8129 / 32 |
255.192.0.0 | /10 | 4,194,304 / 16,384 / 64 |
255.128.0.0 | /9 | 8,388,608 / 32,768 / 128 |
255.0.0.0 | /8 (Class A) | 16,777,216 / 65,536 / 256 / 1 |
254.0.0.0 | /7 | 33,554,432 / 131,072 / 512 / 2 |
252.0.0.0 | /6 | 67,108,864 / 262,144 / 1,024 / 4 |
248.0.0.0 | /5 | 134,217,728 / 524,288 / 2,048 / 8 |
240.0.0.0 | /4 | 268,435,456 / 1,048,576 / 4,096 / 16 |
224.0.0.0 | /3 | 536,870,912 / 2,097,152 / 8,192 / 32 |
192.0.0.0 | /2 | 1,073,741,824 / 4,194,304 / 16,384 / 64 |
128.0.0.0 | /1 | 2,147,483,648 / 8,388,608 / 32,768 / 128 |
0.0.0.0 | /0 (The Internet) | 4,294,967,296 / 16,777,216 / 65,536 / 256 |
Netmask v. Address Prefix Length
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