IPv4 to IPv6 Converter
Enter IPv4 addresses one per line and they are converted to IPv6 instantly.
Your text and files never leave your browser — nothing is sent to a server.
How to use
- Enter IPv4 addresses in the left box, one per line, to convert many at once.
- Pick a single notation under “Format” to get just that value on each line.
- “All” puts every notation on one line separated by tabs, so pasting into a spreadsheet splits them into columns.
- Lines that are not valid IPv4 addresses get a ✗ and a notice appears below.
FAQ
When are IPv4-mapped addresses (::ffff:) used?
On servers that accept IPv4 connections through a single IPv6 socket, IPv4 clients show up in IPv6 form. You will often see addresses starting with ::ffff: in server logs and firewall rules.
Should I still use 6to4 addresses?
6to4 is a legacy transition mechanism that RFC 7526 deprecated. Treat it as a reference for reading old configurations or studying.
What is a NAT64 address?
It lets IPv6-only networks reach IPv4 servers. It is formed by appending the IPv4 address to the well-known prefix 64:ff9b::/96.
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