Is this CIDR Calculator free to use?

Yes, CIDR Calculator is 100% free to use online with no installation or account required.

How do I use the CIDR Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

CIDR Calculator — Free Online Tool

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Calculate subnet info from CIDR notation

Note: /24 = 256 addresses, 254 usable hosts.

Subnet

CIDR Prefix (/n)

⚠️ For educational purposes only. Verify results with a qualified professional when making important decisions.