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IPv4 Subnet Calculator

Network and broadcast addresses, host range, and mask from a CIDR.

Enter a CIDR notation IPv4 address and get the network address, broadcast address, usable host range, subnet mask, and host count.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Bitwise AND of the IP and the prefix-length-derived mask gives the network address; the host part filled with 1s gives the broadcast.

In depth

Enter a CIDR notation IPv4 address and get the network address, broadcast address, usable host range, subnet mask, and host count.