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Subnet Cheat Sheet
Look up subnet masks, hosts, and ranges in one quick table.
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About Subnet Cheat Sheet
Interactive IPv4 subnet cheat sheet: CIDR prefix, subnet mask, host counts, and usable ranges at a glance.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Subnet Cheat Sheet on Wikipedia. More: all developer tools.
Frequently Asked Questions about Subnet Cheat Sheet
How do I use the Subnet Cheat Sheet?
Open the Subnet Cheat Sheet and use the controls in the workspace below: look up subnet masks, hosts, and ranges in one quick table. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Subnet Cheat Sheet free?
Yes. The Subnet Cheat Sheet is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Subnet Cheat Sheet store or share my data?
No. The Subnet Cheat Sheet runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Subnet Cheat Sheet for?
Interactive IPv4 subnet cheat sheet: CIDR prefix, subnet mask, host counts, and usable ranges at a glance. You will find it grouped under Developer Tools together with 78 other free tools on the PrimeFreeTools homepage.
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