IPv4 to IPv6 Converter
Turn an IPv4 address into its IPv4-mapped IPv6 form (::ffff:x.x.x.x). That’s the standard way to represent an IPv4 address inside the IPv6 address space. Handy when a tool or config expects IPv6 format and you have an IPv4. Conversion runs in your browser.
Convert IPv4 to IPv6 Notation
Enter an IPv4 address. We’ll show the IPv4-mapped IPv6 form.
What Is IPv4 to IPv6 Conversion?
IPv4 and IPv6 are different address families. “IPv4 to IPv6” conversion here means writing an IPv4 address in the standard IPv4-mapped IPv6 form: ::ffff:a.b.c.d (in hex, ::ffff: followed by the four octets). So 192.168.1.1 becomes ::ffff:192.168.1.1 (or ::ffff:c0a8:0101 in full hex). That way, IPv6-only software can handle IPv4 addresses in a single format. We don’t assign or route anything — we only convert the notation.
To go the other way (IPv6 notation back to IPv4), use our IPv6 to IPv4 converter. For other formats (decimal, hex), use IP format converter. To check if a string is valid IPv4 or IPv6, use IP address validator.
How to Use the IPv4 to IPv6 Converter
Enter a valid IPv4 address in the box. The IPv4-mapped IPv6 form appears below. You can copy it into configs or scripts. For generating IPv4 addresses to convert, try random IP generator or IP generator. For looking up a real IP’s location, use IP lookup or What is my IP.
Features
- Converts IPv4 to IPv4-mapped IPv6 (::ffff:...)
- Instant; runs in browser
- No signup, no data sent
- Standard RFC 4291 format
Why Use This Tool
When a firewall, app, or API expects IPv6 and you have IPv4. Or when you’re learning how IPv4 fits into the IPv6 space. Pair with subnet calculator for network ranges or DNS lookup for A vs AAAA records.
FAQs
What is IPv4-mapped IPv6?
It’s a way to write an IPv4 address inside the IPv6 space: ::ffff:192.168.1.1. It lets IPv6-only code handle IPv4 addresses in a single format.
Does this assign a real IPv6 address?
No. We only convert the notation. The result is the standard IPv4-mapped form. It doesn’t register or assign anything.
When would I use this?
When a config or API expects IPv6 format and you have an IPv4 address. Or when learning how IPv4 maps into the IPv6 range.
Is the converter free?
Yes. Conversion runs in your browser. No signup.
Can I convert back?
Yes. Use our IPv6 to IPv4 converter to turn ::ffff:x.x.x.x back into the dotted IPv4 address.