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Do you have an IPv4 subnet cheat sheet?
Yes, we do!
Please see a cheat sheet below for common IPv4 subnet sizes and their relevant netmasks and other range details:
| Addresses | Usable hosts | Netmask | |
| /30 | 4 | 1 | 255.255.255.252 |
| /29 | 8 | 5 | 255.255.255.248 |
| /28 | 16 | 13 | 255.255.255.240 |
| /27 | 32 | 29 | 255.255.255.224 |
| /26 | 64 | 61 | 255.255.255.192 |
| /25 | 128 | 125 | 255.255.255.128 |
| /24 | 256 | 253 | 255.255.255.0 |
| /23 | 512 | 509 | 255.255.254.0 |
| /22 | 1024 | 1021 | 255.255.252.0 |
| /21 | 2048 | 2045 | 255.255.248.0 |