.onion Introduced 2004 TLD type Host suffix Status Not in root, but used by Tor clients, servers, and proxies Registry Tor Intended use To designate a hidden service reachable via Tor Actual use Used by Tor users for services in which both the provider and the user are anonymous and difficult to trace Registration restrictions Addresses are "registered" automatically by Tor client when a hidden service is set up Structure Names are opaque strings generated from public keys Documents RFC 7686[1] Tor design document Special Hostnames in Tor specification Dispute policies N/A Registry Website www.torproject.org