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, and they distinguish connecting clients by transport protocol, which may include pluggable transports. Even though bridges don't report a combination of clients by country and transport, it's possible to derive and graph lower and upper bounds from existing usage statistics. 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|
Deployed an attempt to fix frequent crashes of the fallback snowflake proxies.
geoip and geoip6 databases updated to "March 8 2018 Maxmind GeoLite2 Country" (
Release of tor 0.3.2.10, 0.3.1.10, and 0.2.9.15, which offer better resistance against DoS attacks.
blog post ticket
|2018-02-27 to 2018-03-02||
Less than 3 bandwidth authorities are available.
Tor 0.3.3.2-alpha reaches deb.torproject.org repositories
Tor 0.3.3.2-alpha reaches FreeBSD repositories
Tor 0.3.3.2-alpha is released (containing important denial-of-service migitations for relays)
geoip and geoip6 databases updated to "February 7 2018 Maxmind GeoLite2 Country" (
|2018-02-01 to 2018-02-05||Iran meek Unknown||
Drop of meek users in Iran; other transports not affected.
|2018-01-24 to present||webstats||
Tor Browser update pings roughly halve, again. The beginning corresponds with the release of Tor Browser 7.5; however unlike with Tor Browser 6.5.2, there was no change to
Tor Browser 7.5 is released. It adds the default obfs4 bridge noisetor01:46089.
Some more directory authorities upgrade to 0.3.2.9 which enforces new requirements for the exit flag. ~50 relays lose the exit flag
|2018-01-18 to 2018-02-24||snowflake||
Outage of Snowflake broker caused by the disabling of the Let's Encrypt TLS-SNI-01 challenge.
Tor 0.3.2.9 reaches deb.torproject.org.
relay versions graph
|2017-12-12 to 2018-01-18||meek||
Outage of the meek.bamsoftware.com (unthrottled for public use), meek.bamsoftware.com:7443 (former meek-azure, now unused), and gaeuploader.meek.bamsoftware.com (used by GAEuploader) bridges.
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.