Subnet Mask
/22 Subnet Mask
A /22 prefix means the subnet mask is 255.255.252.0. It has 10 host bits, giving 1,024 total addresses and 1,022 usable hosts.
/22 at a glance
| Property | Value |
|---|---|
| CIDR prefix | /22 |
| Subnet mask | 255.255.252.0 |
| Wildcard mask | 0.0.3.255 |
| Total addresses | 1,024 |
| Usable hosts | 1,022 |
| Host bits | 10 |
How it is calculated
A /22 sets the first 22 bits to 1 (network) and the remaining 10 bits to 0 (host). Usable hosts = 210 − 2 = 1,022.
The wildcard mask 0.0.3.255 is the inverse — used in Cisco ACLs and OSPF network statements.
Frequently asked questions
What is a /22 subnet mask?
A /22 equals 255.255.252.0 in dotted decimal (wildcard 0.0.3.255). It provides 1,024 total addresses and 1,022 usable hosts.
How many hosts are in a /22?
A /22 has 10 host bits, so it supports 1,022 usable hosts.
What is the wildcard mask for /22?
The wildcard (inverse) mask for /22 is 0.0.3.255, used in Cisco ACLs and OSPF statements.
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