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IPv4 Subnet Calculator

Calculate network, mask, broadcast, host range, and capacity from CIDR.

About the IPv4 Subnet Calculator

Calculate network, mask, broadcast, host range, and capacity from CIDR. It runs entirely in your browser — nothing is uploaded to a server, so it is fast and private. Just use it and go.

How to use the IPv4 Subnet Calculator

  1. Enter or paste your input into the tool above.
  2. Adjust any options to fit what you need.
  3. Copy or download the result.

Frequently asked questions

Is the IPv4 Subnet Calculator free?

Yes. This tool is completely free to use, with no sign-up required.

Is my data safe?

Everything runs locally in your browser. Your input never leaves your device.

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