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 in the metrics-timeline Git repository and might be related to the displayed graph.
|Dates||Places/Protocols||Description and Links|
Release of Tor Browser 10.5, first stable release that includes Snowflake.
Snowflake bridge down for scheduled upgrade.
|2021-06-12 to 2021-06-13||snowflake||
Outage of Snowflake bridge.
|2021-06-10 to present||
Experiment to test latencies between relays.
status.torproject.org post announcing start
geoip and geoip6 databases updated to "IPFire Project Thu, 10 Jun 2021 05:17:29 GMT" (
|2021-06-04 to present||Nigeria||
Block of Twitter in Nigeria. Increase in the number of bridge users.
article relay graph bridge graph
|2021-05-17 to 2021-06-05||
Experiment to test the accuracy of relays' advertised bandwidth estimation.
status.torproject.org post announcing start post announcing end advertised bandwidth graph relay flags graph
|2021-05-14 to 2021-05-18||meek Unknown||
The number of meek users temporarily drops to < 10.
|2021-05-12 to 2021-06-21||snowflake||
Error in stats collection at the Snowflake bridge; user count is erroneously zero.
merge request comment on start comment on end user count graph
geoip and geoip6 databases updated to "IPFire Project Fri, 07 May 2021 05:18:14 GMT" (
Outage of snowflake bridge.
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.