Built by a network engineer who got tired of bad subnet calculators. The tools you use day-to-day, but built fast and accurate. Nothing leaves your browser — every calculation runs client-side.

The site is a single-page-per-tool design with no build step, no framework, and no server-side logic. Open a calculator, type, get an answer. Reference pages (CIDR cheat sheet, IPv6 notation, common ports) are static so they load instantly and work offline once cached.

Every input you type into a calculator stays in your browser. There is no backend that receives subnet inputs, MAC addresses, or capture filters — the JavaScript runs locally and produces results without making a network request. The only third-party code on the page is Google AdSense (disclosed in the privacy policy) and Google Fonts.

The site is hosted on Cloudflare Pages.

For feature requests or bug reports, use the feedback form.