Yes, completely free with no signup required.

Does my data leave my device?

No. All processing happens locally in your browser — nothing is sent to a server.

Does it work on mobile?

Yes. The tool is mobile-first and works on any modern browser.

:: is shorthand for one or more consecutive groups of all-zero 16-bit blocks. Expanding it reveals the full 128-bit address.

IPv6 Expander

Expand any compressed IPv6 address to full 32-hex-digit, 8-group notation — handles :: shorthand, embedded IPv4 addresses, and zone IDs. Copy in one click.

100% client-side · no upload

Input

Output

How to use

Enter a compressed IPv6 address — with :: notation, mixed case, or an embedded IPv4 suffix.
Click "Expand" to see the full 8-group, 32-hex-digit representation.
Copy the expanded or compressed result for use in firewall rules, DNS records, or routing configs.

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Frequently Asked Questions

Is this tool free?: Yes, completely free with no signup required.
Does my data leave my device?: No. All processing happens locally in your browser — nothing is sent to a server.
Does it work on mobile?: Yes. The tool is mobile-first and works on any modern browser.
What is :: in IPv6?: :: is shorthand for one or more consecutive groups of all-zero 16-bit blocks. Expanding it reveals the full 128-bit address.

Last updated: 2026-05-20 By jarvisbox