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|
geoip and geoip6 databases updated to "February 8 2017 Maxmind GeoLite2 Country" (
|2017-02-10 to present||<OR> exit||
Measurement error from bandwidth authority causes decrease in measured bandwidth in Europe.
mailing list post
|2017-02-06 to 2017-08-01||United Arab Emirates obfs3 Unknown||
Increase in obfs3 users from the UAE, from 5K to 100K. Other transports not affected.
transport graph UAE bridge graph ticket
|2017-01-25 to 2017-04-05||webstats||
Tor Browser update pings roughly halve. The beginning corresponds with the release of Tor Browser 6.5.2, which changed the
Tor Browser 7.0a1 released, including Snowflake for GNU/Linux only.
Tor Browser 6.5 is released. It changes the
blog post graph ticket comment about app.update.url
1.0-beta release of GAEuploader, a tool that automates the setting up of meek.
mailing list post
|2017-01-15 to 2017-03-01||United Arab Emirates <OR> Relays Unknown||
Huge spike in relay users (400k+). An anonymous contributor suggests that it may be a botnet, based on the large number of hosts with an open SMB port in the UAE.
graph metrics-team thread Reddit thread comment about botnet
Decreased the rate limit on the meek-azure bridge to 2.0 MB/s, from 3.0 MB/s.
geoip and geoip6 databases updated to "January 4 2017 Maxmind GeoLite2 Country" (
|2016-12-21 to 2016-12-28||<OR> Relays Unknown||
Drop in relay users.
metrics-team thread thread continues
Tor Browser 6.5a6 is released. It fixes the
geoip and geoip6 databases updated to "December 7 2016 Maxmind GeoLite2 Country" (
Decreased the rate limit on the meek-amazon bridge to 2.0 MB/s, from 3.0 MB/s.
|2016-09-23 to 2016-11-28||obfs3||
Outage of default obfs3 bridges "Unnamed" and "Unnamed" (fingerprint AF9F66B7B04F8FF6F32D455F05135250A16543C9). (Start date not known for sure, though it must have been after 2016-09-23; discussed in non-archived tor-team email.)
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.