/10 Subnet Mask
A /10 prefix means the subnet mask is 255.192.0.0. It has 22 host bits, giving 4,194,304 total addresses and 4,194,302 usable hosts.
/10 at a glance
| Property | Value |
|---|---|
| CIDR prefix | /10 |
| Subnet mask | 255.192.0.0 |
| Wildcard mask | 0.63.255.255 |
| Total addresses | 4,194,304 |
| Usable hosts | 4,194,302 |
| Host bits | 22 |
How it is calculated
A /10 sets the first 10 bits to 1 (network) and the remaining 22 bits to 0 (host). Usable hosts = 222 − 2 = 4,194,302.
The wildcard mask 0.63.255.255 is the inverse — used in Cisco ACLs and OSPF network statements.
Frequently asked questions
What is a /10 subnet mask?
A /10 equals 255.192.0.0 in dotted decimal (wildcard 0.63.255.255). It provides 4,194,304 total addresses and 4,194,302 usable hosts.
How many hosts are in a /10?
A /10 has 22 host bits, so it supports 4,194,302 usable hosts.
What is the wildcard mask for /10?
The wildcard (inverse) mask for /10 is 0.63.255.255, used in Cisco ACLs and OSPF statements.
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