Subnet Mask Crib Sheet
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| CIDR (Bits) | Net Mask |
|---|---|
| 8 | 255.0.0.0 |
| 16 | 255.255.0.0 |
| 21 | 255.255.248.0 |
| 23 | 255.255.254.0 |
| 24 | 255.255.255.0 |
| 25 | 255.255.255.128 |
| 26 | 255.255.255.192 |
| 27 | 255.255.255.224 |
| 28 | 255.255.255.240 |
| 29 | 255.255.255.248 |
| 30 | 255.255.255.252 |
| 32 | 255.255.255.255 |