CIDR / Subnet Calculator

Calculate network range, mask, hosts and broadcast for any CIDR.

Free · Runs in your browser · Last updated 2026-05-03

CIDR (IPv4)

About this tool

Enter an IPv4 CIDR like 10.0.0.0/24 to see the network address, broadcast address, subnet mask, host count and usable host range.

Privacy

All processing for CIDR Calculator happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the CIDR Calculator free to use?

Yes. CIDR Calculator is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use CIDR Calculator?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does CIDR Calculator work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

CIDR Calculator works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. CIDR Calculator runs in any modern web browser with no installation, browser extension, or account required.

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