Convert IPv4 addresses to IPv6-mapped form and back.
Free · Runs in your browser · Last updated
Convert IPv4 to IPv4-mapped IPv6 (::ffff:a.b.c.d) and back, with hex / decimal representations.
All processing for IPv4 ↔ IPv6 happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.
Yes. IPv4 ↔ IPv6 is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.
All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.
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.
IPv4 ↔ IPv6 works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.
No. IPv4 ↔ IPv6 runs in any modern web browser with no installation, browser extension, or account required.