Does this validate the address?

Yes, invalid group counts or non-hex characters produce a clear error message.

How does compression choose which zeros to collapse?

It collapses the longest run of consecutive zero groups, per the standard IPv6 notation rules.

Does it handle zone IDs like %eth0?

Zone IDs are stripped before parsing since they aren't part of the address itself.

IPv6 Expander/Compressor

Expand an IPv6 address to full form or compress it to shorthand.

Works Offline

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No Login

No API

IPv6 Address

Enter an IPv6 address

Expanded (full form)

2001:0db8:0000:0000:0000:8a2e:0370:7334

Compressed (shorthand)

2001:db8::8a2e:370:7334

Groups

Group 1

2001

Group 2

0db8

Group 3

0000

Group 4

0000

Group 5

0000

Group 6

8a2e

Group 7

0370

Group 8

7334

About the IPv6 Expander/Compressor

Enter any IPv6 address and instantly see both its fully expanded 8-group form and its compressed double-colon shorthand, plus a breakdown of each individual group.

Examples

Compress address

2001:0db8:0000:0000:0000:8a2e:0370:7334

Output

2001:db8::8a2e:370:7334

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-07 · Runs entirely in your browser