Strange ip adress

Normally all is working fine…but now i got one single IP which is very strange:

Is this a bug in Piwik or is it related to the server…any idea?

I’m using
Piwik 1.10.1
PHP 5.4.11
PHP Tracker API

That looks like an IPv6 IP address to me. Could be wrong but that would be my guess.

If you are not familiar with IPv6 and what the address are like here is a link that may give you a quick run down

Thank you…didn’t know that they are hexadecimal.