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/13 Subnet Mask: 255.248.0.0

A /13 prefix fixes the first 13 bits of the address as the network, leaving 19 bits for hosts. That gives 524,288 addresses, of which 524,286 can be assigned to hosts.

CIDR notation/13
Subnet mask255.248.0.0
Wildcard mask0.7.255.255
Binary mask11111111.11111000.00000000.00000000
Hex mask0xFFF80000
Total addresses524,288
Usable hosts524,286

Example: 10.0.0.0/13

  • Network address: 10.0.0.0
  • First usable host: 10.0.0.1
  • Last usable host: 10.7.255.254
  • Broadcast address: 10.7.255.255

When to use a /13 subnet

Very large private networks. 10.0.0.0/8 is the largest private IPv4 range defined by RFC 1918.

  • 32 /13 subnets fit in a /8.

Frequently Asked Questions

What is the subnet mask for /13?

The subnet mask for /13 is 255.248.0.0, and its wildcard (inverse) mask is 0.7.255.255.

How many hosts are in a /13?

A /13 contains 524,288 addresses. Subtracting the network and broadcast addresses leaves 524,286 usable hosts.