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 check the documentation on Reproducible Metrics.
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|
The Tor Project begins to distribute obfs4 bridges that listen on ports that are reachable in Kazakhstan, despite the ongoing Internet shutdown.
Increased capacity of the mapping to client IP addresses on the snowflake bridge.
issue deployment comment
|2022-01-05 to 2022-01-11||Kazakhstan||
Country-wide Internet shutdown in Kazakhstan. Was preceded by a shutdown of most mobile networks starting 2022-01-04 14:30. Access was restored for a few hours each day.
Cloudflare blog post RIPE Labs blog post NTC thread BBS thread IODA
Outage of the snowflake bridge.
Rebooted the Snowflake bridge to increase the number of CPUs from 4 to 8.
Release of Tor Browser 11.5a1, with an altered DTLS fingerprint in Snowflake to counteract blocking in Russia.
blog post issue NTC post
Release of Tor Browser 11.0.2, containing a new default obfs4 bridge "deusexmachina".
blog post issue
|2021-11-17 to 2022-02-02||obfs4||
Run a Tor Bridge campaign, offers rewards for running obfs4 bridges.
blog post about start blog post about end
Removal of roughly 600 "KAX17" non-exit relays.
mailing list post relay graph article
Release of Tor Browser 11.0. Final deprecation of v2 onion services.
blog post deprecation timeline graph
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.