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Official page that tests whether the current connection appears to be using the Tor network.

Search engine for finding indexed Tor onion services, with abuse filtering and public documentation.

Official Tor service distributing bridge relay addresses to users facing network blocking.

Official source repository for the Tor network daemon and core protocol implementation.

Network test that checks whether Tor access appears blocked and contributes measurement data.

Public-health research measuring harmful-content availability and searches on the Tor network.

Historical public mailing-list messages documenting Tor development, research and relay operations.

Archive of Tor Project monthly reports documenting development, research and community activity.

Official archive of older Tor software, websites, mailing lists, reports and project material.

Official community forum for Tor users, relay operators, developers and onion-service administrators.

Official service-status page for Tor Project websites, bridges, directories and network services.

Official interface for exploring public Tor relay and bridge metadata from Onionoo.

Active public discussion archive for Tor relay and bridge operators, support questions and network issues.

Tor Project hub for technical reports, open research questions, datasets and research safety guidance.

Technical specifications for Tor protocols, directory formats and onion-service behavior.

Question-and-answer archive covering Tor configuration, relays, onion services and research.

Official Rust implementation of Tor with developer documentation and project tracking.

Official Tor archive providing recent and historical network descriptors for reproducible research.

Tor network-health dashboard showing directory consensus, votes, signatures and relay measurements.

Research paper presenting a crawler architecture for collecting dark-web data over Tor.

Historical lookup showing whether an IP address appeared as a Tor relay on a specified date.

Longitudinal study measuring unique Tor onion services while accounting for mirrors and topology bias.

Terminal monitor for inspecting a local Tor process, circuits, connections and relay activity.

Study of whether website fingerprinting can distinguish and identify Tor onion-service traffic.