IP / CIDR Calculator
Calculate network address, broadcast address, host range, subnet mask, and usable host count from any IPv4 CIDR notation — instant, browser-based.
100% client-side · no upload
How to use
- Type your network in CIDR notation, such as 10.0.0.0/8 or 172.16.0.0/12.
- Click Calculate to compute the full subnet details.
- Copy the network address, broadcast, or host range for use in firewall rules, routing configs, or documentation.
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Frequently Asked Questions
- Is this IP/CIDR calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.
Last updated: By jarvisbox