Number of Subnets and Hosts for Various Masks and Netblocks
Number of Subnets and Hosts for Various Masks and Netblocks
Subnets by netblock
| # bits |
Subnetwork Mask |
Effective # of Hosts |
| 16 |
255.255.0.0 |
65534 |
| 17 |
255.255.128.0 |
32766 |
| 18 |
255.255.192.0 |
16382 |
| 19 |
255.255.224.0 |
8190 |
| 20 |
255.255.240.0 |
4094 |
| 21 |
255.255.248.0 |
2046 |
| 22 |
255.255.252.0 |
1022 |
| 23 |
255.255.254.0 |
510 |
| 24 |
255.255.255.0 |
254 |
| 25 |
255.255.255.128 |
126 |
| 26 |
255.255.255.192 |
62 |
| 27 |
255.255.255.224 |
30 |
| 28 |
255.255.255.240 |
14 |
| 29 |
255.255.255.248 |
6 |
| 30 |
255.255.255.252 |
2 |
| 31 |
255.255.255.254 |
- |
| 32 |
255.255.255.255 |
- |
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