What is a /22 subnet?
1,022 usable hosts out of 1,024 addresses, behind netmask 255.255.252.0.
| Prefix | /22 |
|---|---|
| Netmask | 255.255.252.0 |
| Wildcard | 0.0.3.255 |
| Total addresses | 1,024 |
| Usable hosts | 1,022 |
| Example block | 10.0.0.0/22 |
| Usable host range | 10.0.0.1 – 10.0.3.254 |
| Broadcast | 10.0.3.255 |
A /22 fixes the first 22 bits of the address as the network and leaves 10 for hosts — 1,024 addresses in all.
Of those, 1,022 can be given to a machine: the first address names the network itself, and the last is the broadcast address.
A comfortable size for a large subnet or a small site — more than a single /24, without committing a whole /16.
It is 4 times the size of a /24.
Other subnet sizes
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