“Tor metrics are the ammunition that lets Tor and other security advocates argue for a more private and secure Internet from a position of data, rather than just dogma or perspective.”
— Bruce Schneier (June 1, 2016)
We estimate the number of users by analyzing the requests induced by clients to relays and bridges.
This graph shows the estimated number of clients connecting via bridges. These numbers are derived from directory requests counted on bridges. Bridges resolve client IP addresses of incoming directory requests to country codes, so that graphs are available for most countries. For further details see these questions and answers about user statistics.
The following events have been manually collected on this wiki page and might be related to the displayed graph.
|Dates||Places/Protocols||Description and Links|
|2017-11-15||meek||Outage of meek-amazon bridge.|
|2017-11-01||meek||Turned off the old meek-amazon CDN endpoint d2zfqthxsdq309.cloudfront.net.|
Mailing list post
|2017-10-14||snowflake||Activated client IP address statistics on the Snowflake server and standalone proxies.|
|2017-10-05||ipv4||geoip database updated to "October 4 2017 Maxmind GeoLite2 Country" (|
|2017-10-05||ipv6||geoip6 database updated to "October 4 2017 Maxmind GeoLite2 Country" (|
|2017-09-02 to 2017-09-21||obfs4 Unknown||About a 35% increase in obfs4 users before returning to normal. Happened in many countries. Other transports do not have it.|
|2017-09-01 to 2017-09-20||obfs4||A flood of over 4,000 obfs4 bridges nicknamed "Machiavelli".|
Graph of number of bridgesTor-relays postMetrics-team threadTweet
This material is supported in part by the National Science Foundation under Grant No. CNS-0959138. Any opinions, finding, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. "Tor" and the "Onion Logo" are registered trademarks of The Tor Project, Inc.. Data on this site is freely available under a CC0 no copyright declaration: To the extent possible under law, the Tor Project has waived all copyright and related or neighboring rights in the data. Graphs are licensed under a Creative Commons Attribution 3.0 United States License.