EN
Maximal IPv6 address length
6
points
In this article, we're going to have a look at what is the maximal length for IP v6 addresses.
Quick overview:
Maximal IP v6 length is 45 characters.
Simple preview:

Explanation
The most commonly known IP address format is:
2001:0db8:0000:0000:0000:ff00:0042:8329
8 * 4 + 7 = 39 characters (hexadecimal numbers separated with :
character)
That can be written in shorter form too:
2001:db8:0:0:0:ff00:42:8329
// or
2001:db8::ff00:42:8329
In practice there is available IPv4-mapped IPv6 addresses format too:
ffff:ffff:ffff:ffff:ffff:ffff:192.168.100.100
6 * 4 + 6 + 4 * 3 + 3 = 45 characters