Subnet Mask Information – Quick Reference Sheet
| Address | Bits | Pref | NetMask |
| 1 | 0 | /32 | 255.255.255.255 |
| 2 | 1 | /31 | 255.255.255.254 |
| 4 | 2 | /30 | 255.255.255.252 |
| 8 | 3 | /29 | 255.255.255.248 |
| 16 | 4 | /28 | 255.255.255.240 |
| 32 | 5 | /27 | 255.255.255.224 |
| 64 | 6 | /26 | 255.255.255.192 |
| 128 | 7 | /25 | 255.255.255.128 |
| 256 | 8 | /24 | 255.255.255 |
| 512 | 9 | /23 | 255.255.254 |
| 1 K | 10 | /22 | 255.255.252 |
| 2 K | 11 | /21 | 255.255.248 |
| 4 K | 12 | /20 | 255.255.240 |
| 8 K | 13 | /19 | 255.255.224 |
| 16 K | 14 | /18 | 255.255.192 |
| 32 K | 15 | /17 | 255.255.128 |
| 64 K | 16 | /16 | 255.255 |
| 128 K | 17 | /15 | 255.254 |
| 256 K | 18 | /14 | 255.252 |
| 512 K | 19 | /13 | 255.248 |
| 1 M | 20 | /12 | 255.24 |
| 2 M | 21 | /11 | 255.224 |
| 4 M | 22 | /10 | 255.192 |
| 8 M | 23 | /9 | 255.128 |
| 16 M | 24 | /8 | 255 |
| 32 M | 25 | /7 | 254 |
| 64 M | 26 | /6 | 252 |
| 128 M | 27 | /5 | 248 |
| 256 M | 28 | /4 | 240 |
| 512 M | 29 | /3 | 224 |
| 1024 M | 30 | /2 | 192 |
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