IPv4 Subnet Calculator
Drop in any IPv4 CIDR like 192.168.1.0/24 or 10.0.0.0/8 and get the full subnet breakdown: network address, broadcast address, usable host range, subnet mask in dotted-decimal and binary, wildcard mask (for ACLs), total and usable host counts, IP class, and whether the range is private (RFC 1918), loopback, link-local, multicast, CGNAT or public. Computation is pure bitwise on 32-bit unsigned integers — runs entirely in your browser.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Calculator
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Frequently asked
Is IPv4 Subnet Calculator free to use?
Yes. IPv4 Subnet Calculator is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — IPv4 Subnet Calculator runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does IPv4 Subnet Calculator work?
Open IPv4 Subnet Calculator, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does IPv4 Subnet Calculator support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. IPv4 Subnet Calculator uses standard web APIs and does not require any plugin, extension, or sign-up.