IP
Web utility
IPv4 Subnet Calculator
Calculate network, range, mask, and usable hosts from CIDR. Private by default, with all processing done in your browser.
IPv4 CIDR
Result
Your result will appear here.Ready — everything happens locally in your browser.
How to use this tool
A quick ipv4 subnet calculator workflow
Calculate network, range, mask, and usable hosts from CIDR. Paste or enter your data, use the available controls, then copy or download the result when it is ready.
- Everything runs in your browser, so your working data stays on your device.
- No account, installation, or upload is needed.
- Use the related utilities below when you need the next step in your workflow.