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Maximal IPv6 address length

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In this article, we're going to have a look at what is maximal length IP v6 address.

Quick overview:

Maximal IP v6 length is 45.

Explaination

Most commonly know IP address format is:

2001:0db8:0000:0000:0000:ff00:0042:8329

8 * 4 + 7 = 39 characters (hexadecimal numbers separated with : character)

What can be written in shorter form too:

2001:db8:0:0:0:ff00:42:8329 
// or 
2001:db8::ff00:42:8329

In practive there is IPv4-mapped IPv6 addresses format too:

ffff:ffff:ffff:ffff:ffff:ffff:192.168.100.100

6 * 4 + 6 + 4 * 3 + 3 = 45 characters

References

  1. IPv4-mapped IPv6 addresses - Wikipedia
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