CIDR prefix
/13
255.248.0.0
524,286 usable hosts · 524,288 addresses
The mask for /13 is 255.248.0.0 — 524,288 addresses, 524,286 usable hosts. Large enterprise and carrier networks.
Mask
255.248.0.0
Wildcard
0.7.255.255
Addresses
524,288
Hosts
524,286
Worked example: 10.0.0.0/13
Network address10.0.0.0/13
Broadcast address10.7.255.255
First host10.0.0.1
Last host10.7.255.254
FAQ — /13
What is the subnet mask for /13?
The subnet mask for /13 is 255.248.0.0 (wildcard: 0.7.255.255). The first 13 bits are the network part, the remaining 19 are the host part.
How many hosts fit in a /13?
A /13 block holds 524,288 addresses, of which 524,286 are usable hosts (the network and broadcast addresses are excluded).
How many /13 subnets fit in a /8?
A /8 network divides into 32 /13 subnets.
What is a /13 used for?
Large enterprise and carrier networks.