What does this tool do?
The IPv6 Converter transforms an IPv6 address between its fully expanded, compressed and IPv4-mapped forms. It lets network engineers, developers and teams migrating to IPv6 quickly see the different representations of the same address.
How to use it
- Enter an address, domain or value.
- View the results instantly.
- Copy the details you need.
Expanding and compressing
When you enter a shortened address like 2001:db8::1, the tool expands it to 2001:0db8:0000:0000:0000:0000:0000:0001, showing the zeros in each group and the skipped blocks explicitly. It also compresses a fully written address to the shortest canonical form following the RFC 5952 rules. This helps you get a consistent representation when comparing configurations or matching log entries, and the whole operation runs in your browser.
IPv4-mapped addresses
IPv4-mapped IPv6 addresses such as ::ffff:192.168.1.1 are common in dual-stack environments where IPv4 and IPv6 stacks operate together. The tool recognizes the embedded IPv4 portion of these addresses and shows it alongside the corresponding hexadecimal form, so you can clearly see how addresses map across each other in transition scenarios.
Frequently asked questions
Why does compression use a double colon (::)?
The double colon replaces consecutive blocks of zeros and may appear only once in an address. The tool follows RFC 5952 and compresses the longest run of zeros.
What is the expanded form good for?
The fully expanded form makes it easier to compare whether two addresses are truly identical and to read subnet boundaries, because every block is written out explicitly.
Does it check whether the address is valid?
Yes, inputs with invalid characters, too many colons or the wrong number of blocks are flagged as errors, so only well-formed addresses are converted.
Is IPv6 Converter free?
Yes. IPv6 Converter and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. IPv6 Converter works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.