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IPv6 Compressor / Expander
Enter an IPv6 address in either compressed or expanded form to see both notations side by side.
How to use this tool
- 1Enter an IPv6 address (compressed or expanded).
- 2See the fully expanded 8-group form.
- 3See the shortest valid compressed form.
Frequently asked questions
What does "::" mean in an IPv6 address?+
It's shorthand for one or more consecutive groups of all zeros, and can only be used once per address (per RFC 5952).
Can I enter an address with an embedded IPv4 part?+
Yes — addresses like ::ffff:192.168.1.1 (used for IPv4-mapped IPv6) are supported.
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