HomeExpand and Compress IPv6 Address

Expand and Compress IPv6 Address

Convert IPv6 addresses between the compressed form (::) and the full expanded form, with validation.

Compressed vs. expanded form

An IPv6 address has 8 groups of 4 hexadecimal digits. To make it shorter, it can be compressed: leading zeros in each group are dropped, and a single run of all-zero groups becomes ::. Example: 2001:0db8:0000:0000:0000:0000:0000:0001 is 2001:db8::1.

The :: can appear only once per address, otherwise it would be ambiguous how many groups it represents.

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