IPv6 Address Expander
Expand and compress IPv6 addresses (RFC 5952) — validate and normalize entirely in your browser
About this tool
Expand a compressed IPv6 address to its full 8-group form and compress it back per RFC 5952 — with validation, embedded-IPv4 support, and a per-group breakdown IPv6 Address Expander runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- IPv6 Address Expander is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use IPv6 Address Expander?
Open IPv6 Address Expander, enter or paste your input, and copy the result. The page works without an account.
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