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The OONI Probe Tor test provides an automated way of examining whether Tor works in a tested network. It measures the reachability of Tor directory authorities, OR ports and obfs4 bridge addresses. The Tor network is described as free and open source, providing online anonymity, privacy and censorship circumvention.
A Tor Project page that summarizes resources the project provides for research on improving Tor design, monitoring the Tor network, and studying attacks and defenses for anonymous communication systems. It points researchers to data collection, analysis guidance and measurement and attack tools.
Relay Search is a service in the Tor Project's metrics site for looking up Tor relays. The page renders search results, and the site's data is released under a CC0 no copyright declaration.
Tor measurement project collecting performance data for public relays, bridges and onion services.
Public-health research measuring harmful-content availability and searches on the Tor network.
Dizzy is an open-source crawling and analysis system for onion services. It implements techniques to explore, update, check, and classify onion services at scale without overwhelming the Tor network. It was deployed in April 2021 and used to analyze more than 63.3 million crawled onion webpages, focusing on domain operations, web content, cryptocurrency usage, and web graph.
An arXiv paper presenting a large-scale analysis of the Tor network using a crawler called Mimir, which collects and visits linked content. The authors report a dataset of pages from more than 25k sites and examine network topology, replicated content and content types.
An arXiv paper measuring onion website discovery and Tor users' interests with honeypots. The authors deployed honeypot onion websites in March–April 2025 and seeded links via three channels to observe interaction events. They report that human users almost without exception originated from Ahmia.fi, and that the CSAM-themed honeypot drew markedly higher engagement than the others.
