http://iyptqjjx5gtzukc2gtgywqq4johsjdtrudjdjrjnsn7ftqnjwdoaoyad.onion/wiki/Tor
Servers configured to receive inbound connections only through Tor are called hidden services. Rather than revealing a server's IP address (and thus its network location), a hidden service is accessed through its onion address . The Tor network understands these addresses and can route data to and from hidden services, even those hosted behind firewalls or network address translators (NAT), while preserving the anonymity of both parties.