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IP Subnet Calculator

Find the network address, subnet mask, broadcast address, wildcard mask and usable host range for any IPv4 address and prefix length.

Rules last checked 25 October 2026Every step shown

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An IPv4 address like 10.0.5.20/24. You can also give the prefix below.

Network address

192.168.1.128/26

Subnet mask
255.255.255.192
Usable hosts
192.168.1.129 to 192.168.1.190
Number of usable hosts
62
Broadcast address
192.168.1.191
Wildcard mask
0.0.0.63

192.168.1.130/26 is in network 192.168.1.128, mask 255.255.255.192, with 62 usable addresses from 192.168.1.129 to 192.168.1.190.

How it's worked out

  1. Block size2^(32 − 26)64
  2. Networkthe address rounded down to a multiple of the block size192.168.1.128
  3. Usable hostsblock size − 2 (network and broadcast)62

How it works

Block size = 2^(32 − prefix) · Usable hosts = block size − 2

Worked example

192.168.1.130/26 has a block size of 64, so it's in network 192.168.1.128 with broadcast 192.168.1.191, mask 255.255.255.192, and 62 usable hosts from .129 to .190.

Questions people ask

How many hosts are in a /24?

256 addresses, of which 254 are usable: the first is the network address and the last the broadcast.

What is a /26 subnet mask?

255.255.255.192, giving 64 addresses and 62 usable hosts.

What is a wildcard mask?

The inverse of the subnet mask, used in router access lists: 0.0.0.63 for a /26.

Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem