This system hosts a Tor node. Tor is a network to enable anonymous political speech. Unfortunately, lots of people abuse this network to be lame little script kiddies, and download disgusting scheisseporn.
This means I'm not the one hacking you / visiting your site.
I try to watch the traffic coming out this node and stop hacking attempts, but if you are being hacked please mail andrew_kbh on yahoo period com with your victim IP, and I'll block it - on my Tor node only (note that the rest of the Tor network will continue to send you traffic).
It is easy to block all Tor nodes if you want to though, see Peeling the Onion for inspiration. DNSTRIGGER