Subnet Calculator
Divide a network into equal subnets — enter a base CIDR and desired subnet count to get the full network, host range, and broadcast for each subnet.
100% client-side · no upload
How to use
- Enter your base network in CIDR notation on the first line, e.g. 192.168.0.0/22.
- Enter how many subnets you need on the second line, e.g. 4.
- Click Calculate subnets to see the full subnet list with all address details.
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Frequently Asked Questions
- Is this subnet calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All subnet 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