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|
Version 0.0.13 of the Snowflake extension is released, decreasing the poll frequency to once every 300 s. The standalone proxy-go instances still poll once every 5 s.
Pointed snowflake-broker.torproject.net (one of three domain names for the Snowflake broker) to a new broker instance set up with IPv6. Metrics unintentionally start being collected from the new instance, instead of the old instance that was still in use.
|2019-10-03 to present||China Bridges Unknown||
New default bridge, 188.8.131.52, is already blocked by the GFW – two days after the Tor Browser alpha release that shipped with it. The block may have happened sooner, though. We only tested the bridge just now.
new default bridge
Release of Tor Browser 9.0a7, the first release that has Snowflake for Windows.
blog post ticket
|2019-07-02 to 2019-08-26||Iran <OR> Relays Bridges||
Relays in Iran are reported to be unblocked once again, and user numbers recover to about 25% of the maximum they had reached during the previous period of unblocking. They then drop precipitously, and
ticket comment comment
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.