Netmasks (Subnet Masks), CIDR, and Hosts
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| Netmask | Inverse | /CIDR | Usable IP Addresses |
|---|---|---|---|
| 0.0.0.0 | 255.255.255.255 | /0 | 4,294,967,294 |
| 128.0.0.0 | 127.255.255.255 | /1 | 2,147,483,646 |
| 192.0.0.0 | 63.255.255.255 | /2 | 1,073,741,822 |
| 224.0.0.0 | 31.255.255.255 | /3 | 536,870,910 |
| 240.0.0.0 | 15.255.255.255 | /4 | 268,435,454 |
| 248.0.0.0 | 7.255.255.255 | /5 | 134,217,726 |
| 252.0.0.0 | 3.255.255.255 | /6 | 67,108,862 |
| 254.0.0.0 | 1.255.255.255 | /7 | 33,554,430 |
| 255.0.0.0 | 0.255.255.255 | /8 | 16,777,214 |
| 255.0.0.0 | 0.127.255.255 | /9 | 8,388,606 |
| 255.128.0.0 | 0.63.255.255 | /10 | 4,194,302 |
| 255.192.0.0 | 0.31.255.255 | /11 | 2,097,150 |
| 255.224.0.0 | 0.15.255.255 | /12 | 1,048,574 |
| 255.240.0.0 | 0.7.255.255 | /13 | 524,286 |
| 255.248.0.0 | 0.3.255.255 | /14 | 262,142 |
| 255.252.0.0 | 0.1.255.255 | /15 | 131,070 |
| 255.255.0.0 | 0.0.255.255 | /16 | 65,534 |
| 255.255.128.0 | 0.0.127.255 | /17 | 32,766 |
| 255.255.192.0 | 0.0.63.255 | /18 | 16,382 |
| 255.255.224.0 | 0.0.31.255 | /19 | 8,190 |
| 255.255.240.0 | 0.0.15.255 | /20 | 4,094 |
| 255.255.248.0 | 0.0.7.255 | /21 | 2,046 |
| 255.255.252.0 | 0.0.3.255 | /22 | 1,022 |
| 255.255.254.0 | 0.0.1.255 | /23 | 510 |
| 255.255.255.0 | 0.0.0.255 | /24 | 254 |
| 255.255.255.128 | 0.0.0.127 | /25 | 126 |
| 255.255.255.192 | 0.0.0.63 | /26 | 62 |
| 255.255.255.224 | 0.0.0.31 | /27 | 30 |
| 255.255.255.240 | 0.0.0.15 | /28 | 14 |
| 255.255.255.248 | 0.0.0.7 | /29 | 6 |
| 255.255.255.252 | 0.0.0.3 | /30 | 2 |
| 255.255.255.254 | 0.0.0.1 | /31 | 0 |
| 255.255.255.255 | 0.0.0.0 | /32 | 1 |
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