You are probably visiting this web site because you saw this host name in your log files. This server is part of a volunteer-supported distributed network of servers running a program called Tor. Tor is used to anonymize web browsing and publishing, instant messaging, IRC, SSH, and other applications using the TCP protocol. Tor aims to provide internet users with protection against "traffic analysis," a form of network surveillance that threatens personal anonymity and privacy, confidential business activities and relationships, and state security.
If you are investigating abuse that you believe passed through this IP address, you should know that it probably did not originate from this server and the operator of this server has no effective means of tracing the origins of the encrypted traffic that has passed through this server.
Tor server operators regret that some users may behave abusively, but we also feel that providing a resource that improves anonymity and privacy is important. See the Abuse FAQ at http://tor.eff.org/faq-abuse.html for more information.
You can learn more about Tor at its website: http://tor.eff.org