Our IPv4 cheat sheet is a concise reference guide that provides essential information and quick access to IPv4 (Internet Protocol version 4) subnets. It is particularly useful for network administrators, IT professionals, and students who need to work with IPv4 addresses and networking concepts regularly.
| CIDR | SUBNET MASK | # OF IP ADDRESSES | # OF USABLE IP ADDRESSES |
|---|---|---|---|
| /32 | 255.255.255.255 | 1 | 1 |
| /31 | 255.255.255.254 | 2 | 2* |
| /30 | 255.255.255.252 | 4 | 2 |
| /29 | 255.255.255.248 | 8 | 6 |
| /28 | 255.255.255.240 | 16 | 14 |
| /27 | 255.255.255.224 | 32 | 30 |
| /26 | 255.255.255.192 | 64 | 62 |
| /25 | 255.255.255.128 | 128 | 126 |
| /24 | 255.255.255.0 | 256 | 254 |
| /23 | 255.255.254.0 | 512 | 510 |
| /22 | 255.255.252.0 | 1,024 | 1,022 |
| /21 | 255.255.248.0 | 2,048 | 2,046 |
| /20 | 255.255.240.0 | 4,096 | 4,094 |
| /19 | 255.255.224.0 | 8,192 | 8,190 |
| /18 | 255.255.192.0 | 16,384 | 16,382 |
| /17 | 255.255.128.0 | 32,768 | 32,766 |
| /16 | 255.255.0.0 | 65,536 | 65,534 |
| /15 | 255.254.0.0 | 131,072 | 131,070 |
| /14 | 255.252.0.0 | 262,144 | 262,142 |
| /13 | 255.248.0.0 | 524,288 | 524,286 |
| /12 | 255.240.0.0 | 1,048,576 | 1,048,574 |
| /11 | 255.224.0.0 | 2,097,152 | 2,097,150 |
| /10 | 255.192.0.0 | 4,194,304 | 4,194,302 |
| /9 | 255.128.0.0 | 8,388,608 | 8,388,606 |
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 |
| /7 | 254.0.0.0 | 33,554,432 | 33,554,430 |
| /6 | 252.0.0.0 | 67,108,864 | 67,108,862 |
| /5 | 248.0.0.0 | 134,217,728 | 134,217,726 |
| /4 | 240.0.0.0 | 268,435,456 | 268,435,454 |
| /3 | 224.0.0.0 | 536,870,912 | 536,870,910 |
| /2 | 192.0.0.0 | 1,073,741,824 | 1,073,741,822 |
| /1 | 128.0.0.0 | 2,147,483,648 | 2,147,483,646 |
| /0 | 0.0.0.0 | 4,294,967,296 | 4,294,967,294 |
