Web IP Calculator

A dependency-free single-page IP calculator for IPv4 and IPv6 prefixes.

Live site: https://netsampler.github.io/ip/

Screenshot

Run

npm run dev

Then open http://localhost:4173.

Set a different port with any of these:

npm run dev -- --port 3000
npm run dev -- -p 3000
npm run dev -- 3000
PORT=3000 npm run dev

The app also works by opening index.html directly in a browser.

Controls

• Type an IPv4 or IPv6 address/prefix to calculate the normalized range.
• Use the Current representation control to view addresses as regular notation, hex, binary, or an integer.
• IPv4 defaults to regular dotted notation; IPv6 defaults to expanded hex.
• The current prefix is saved in the URL as ?prefix=... so bookmarks and shared links reopen the same calculation.
• Use ArrowUp / ArrowDown to move by -2ⁿ / +2ⁿ to adjacent prefixes.
• Use the prefix navigation buttons beside the field for the same moves without a keyboard.
• Use PageUp / PageDown to jump by ten prefixes.
• Use mouse back/forward side buttons to move through committed prefix history.
• Press Tab to accept the inline completion.