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Networking, Domains & Internet

CIDR Calculator.

Addresses and results remain in this browser. Convert prefix length, subnet mask, wildcard mask and address counts. Uses exact local arithmetic and independent verification.

Use CIDR 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 CIDR Calculator upload my data?

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

What output does CIDR Calculator create?

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

IPv4 Subnet CalculatorCalculate network, broadcast, host range, masks and address counts from IPv4 CIDR. Uses exact local arithmetic and independent verification.Subnet Mask ConverterConvert dotted-decimal masks, prefixes, binary masks and wildcard masks. Uses exact local arithmetic and independent verification.IP Range CalculatorCalculate inclusive IPv4 ranges and summarizehem as CIDR blocks. Uses exact local arithmetic and independent verification.
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