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IP Range Calculator.

Addresses and results remain in this browser. Calculate inclusive IPv4 ranges and summarizehem as CIDR blocks. Uses exact local arithmetic and independent verification.

Use IP Range Calculator

Private in this browser. Addresses and results stay in this browser.

Tool options
Preparing the local tool…

How it works

  1. 01

    Enter an address, mask, prefix or range.

  2. 02

    Run the exact local calculation.

  3. 03

    Review assumptions before downloading the verified result.

Frequently asked questions

Does this query the network?

No. The result is only a local calculation.

Does IP Range Calculator upload my data?

IP Range Calculator runs locally in your browser. Addresses and results stay in this browser.

What output does IP Range Calculator create?

IP Range Calculator creates Json output after the result passes its local verification checks.

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