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 distinguish connecting clients by transport protocol, which may include pluggable transports, so that graphs are available for different transports. 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|
|2020-12-05 to 2020-12-09||meek moat||
An update to an Azure CDN edge server TLS certificate causes an outage of meek and Moat. It is fixed by the release of Tor Browser 10.0.6, which updates the built-in public key pinning of obfs4proxy.
ticket blog post meek graph BridgeDB graph certificate transparency
|2020-11-08 to 2020-11-09||snowflake||
Outage of the snowflake bridge
|2020-10-27 to present||Tanzania, United Republic of <OR> obfs4||
Blocking of Tor and default obfs4 bridges during elections in Tanzania.
Deployed version 0.4.2 of the Snowflake WebExtension, with better counting of clients.
Shutdown of default obfs4 bridge frosty.
Deployed version 0.4.1 of the Snowflake WebExtension, with NAT type detection in the browser.
|2020-08-09 to 2020-08-12||Belarus||
Internet shutdowns in Belarus, during protests following a presidential election.
Deployed NAT-aware matching at the Snowflake broker.
|2020-06-30 to present||Ethiopia||
Internet shutdown in Ethiopia.
article IODA relay users graph
Release of Tor Browser 10.0a1, the first release with Snowflake for Android.
blog post ticket
Release of Tor Browser 9.5a13, the first release with Turbo Tunnel session persistence features for Snowflake.
blog post ticket
Redeployed the Snowflake bridge with support for non–Turbo Tunnel clients and KCP–Turbo Tunnel clients, removing support for QUIC–Turbo Tunnel clients.
|2015-12-31 to 2020-06-04||Mexico||
The Telmex ISP in Mexico blocks seven directory authorities.
mailing list post article
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.