IPV6_MAX_STR_LEN variable

Longest an IPv6 address can be as text: 39 characters, from eight groups of four hex digits plus seven colons.

Signature:

IPV6_MAX_STR_LEN = 39

Remarks

A bound for buffer sizing and validation, not a formatting rule — a compressed address such as ::1 is far shorter, and this package's own output is compressed. It does not cover the IPv4-mapped form (::ffff:255.255.255.255, 45 characters), a scope-zone suffix, or a /prefix.

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