/13 Subnet Mask
A /13 prefix means the subnet mask is 255.248.0.0. It has 19 host bits, giving 524,288 total addresses and 524,286 usable hosts.
/13 at a glance
| Property | Value |
|---|---|
| CIDR prefix | /13 |
| Subnet mask | 255.248.0.0 |
| Wildcard mask | 0.7.255.255 |
| Total addresses | 524,288 |
| Usable hosts | 524,286 |
| Host bits | 19 |
How it is calculated
A /13 sets the first 13 bits to 1 (network) and the remaining 19 bits to 0 (host). Usable hosts = 219 − 2 = 524,286.
The wildcard mask 0.7.255.255 is the inverse — used in Cisco ACLs and OSPF network statements.
Frequently asked questions
What is a /13 subnet mask?
A /13 equals 255.248.0.0 in dotted decimal (wildcard 0.7.255.255). It provides 524,288 total addresses and 524,286 usable hosts.
How many hosts are in a /13?
A /13 has 19 host bits, so it supports 524,286 usable hosts.
What is the wildcard mask for /13?
The wildcard (inverse) mask for /13 is 0.7.255.255, used in Cisco ACLs and OSPF statements.
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