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|
|2018-06-20 to present||Venezuela||
Venezuela's largest ISP, CANTV, blocks direct access to Tor and the IP addresses of default bridges. meek and non-default bridges are reported to work.
ticket mailing list post Access Now report
geoip and geoip6 databases updated to "June 7 2018 Maxmind GeoLite2 Country" (
Release of Tor Browser 8.0a8, removes meek-amazon option.
Release of Tor Browser 7.5.5, removes meek-amazon option.
|2018-05-23 to present||Bridges Unknown||
Sharp increase in bridge users in many unrelated countries, affecting even the global aggregate. Relay users unaffected. The graphs reach a peak around 2018-06-07 and then begin falling again. An incomplete sampling of affected countries: Bangladesh Chile Indonesia Morocco Venezuela.
relay graph bridge graph
geoip and geoip6 databases updated to "May 1 2018 Maxmind GeoLite2 Country" (
Disabled the d2cly7j4zqgua7.cloudfront.net CDN endpoint for meek-amazon.
Tor Browser ticket Orbot ticket
Release of Tor Browser 8.0a7, which changes the default Snowflake rendezvous to use an Azure domain front, instead of the Google one that had been non-functional since 2018-04-13.
blog post ticket
The meek-amazon bridge imposes a rate limit of 1 MB/s.
Snowflake client registrations (based on domain fronting) stop working, because of a Google infrastructure change that stops domain fronting from working. The time of the change is between 2018-04-13 14:00:00 and 2018-04-13 18:00:00, based on when the bandwidth graph of the Snowflake bridge 5481936581E23D2D178105D44DB6915AB06BFB7F went to zero.
geoip and geoip6 databases updated to "April 3 2018 Maxmind GeoLite2 Country" (
Reinstated periodic restarts of the fallback snowflake proxies.
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.