IP / CIDR Calculator — Subnet Calculator Online
Calculate network address, broadcast address, subnet mask, host range, and usable IPs from any CIDR notation.
Frequently Asked Questions about IP / CIDR Calculator
- Is IP / CIDR Calculator completely free to use?
- Yes, IP / CIDR Calculator is 100% free with no sign-up, no watermarks, and no usage limits.
- Is my data private?
- IP / CIDR Calculator runs entirely in your browser — no data is ever sent to our servers. Your content stays on your device.
- Does it work offline?
- Once the page has loaded, IP / CIDR Calculator works fully offline in your browser — no internet connection is required.
- Is my sensitive data processed locally?
- Yes, all cryptographic operations run in your browser using the Web Crypto API. Your keys and secrets never leave your device.
- Does IP / CIDR Calculator work on mobile and tablet?
- Yes, IP / CIDR Calculator is fully responsive and works in all modern browsers on desktop, tablet, and mobile.
This tool runs entirely in your browser. No data is ever sent to our servers.