We estimate the number of users by analyzing the requests induced by clients to relays and bridges.
This graph shows the estimated number of directly-connecting clients; that is, it excludes clients connecting via bridges. These estimates are derived from the number of directory requests counted on directory authorities and mirrors. Relays resolve client IP addresses to country codes, so that graphs are available for most countries. Furthermore, it is possible to display indications of censorship events as obtained from an anomaly-based censorship-detection system (for more details, see this technical report). 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|
|2016-08-31||Bridges||CollecTor begins publishing bridge stats from the new bridge authority Bifroest.|
|2016-08-24||Bridges||tor 0.2.8.7 and 0.2.9.2-alpha are released, changing the bridge authority from Tonga to Bifroest.|
|2016-08-18||meek||Changed the meek-amazon CDN price class from "All" to "Use Only US, Canada and Europe."|
|2016-08-12||ipv4 ipv6||geoip and geoip6 databases updated to "August 2 2016 Maxmind GeoLite2 Country" (|
|2016-07-18||ipv4 ipv6||geoip and geoip6 databases updated to "July 6 2016 Maxmind GeoLite2 Country" (|
|2016-07-15||Turkey <OR>||Coup attempt in Turkey. A paper (§ 4.1) reports a decline in Tor users.|
|2016-06-12||ipv4 ipv6||geoip and geoip6 databases updated to "June 7 2016 Maxmind GeoLite2 Country" (|
|2016-05-30||fte||Tor Browser 6.0 released, which lacks the fte pluggable transport on Mac.|
6.0 blog postTicket
|2016-05-13||meek||meek-google's App Engine instance is suspended and meek-google stops working.|
Mailing list post
|2016-05-09||ipv4 ipv6||geoip and geoip6 databases updated to "May 4 2016 Maxmind GeoLite2 Country" (|
|2016-04-28||fte||Tor Browser 6.0a5 and 6.0a5-hardened released, which lacks the fte pluggable transport on Mac.|
6.0a5 blog post6.0a5-hardened blog postTicket
|2016-04-07||ipv4 ipv6||geoip and geoip6 databases updated to "April 5 2016 Maxmind GeoLite2 Country" (|
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.