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|
BridgeDB moves to an rdsys backend.
|2022-02-24 to present||Russia Ukraine||
Russian invasion of Ukraine. In the following days, various social media are partially blocked in Russia. Bridge users increase in Russia; relay and bridge users increase in Ukraine.
Wikipedia Relay users in Russia Bridge users in Russia Relay users in Ukraine Bridge users in Ukraine thread about social media blocks
Outage of the Snowflake bridge.
mailing list post
Tor 0.3.5 reaches end of life.
mailing list post
Switched the snowflake bridge from a load-balanced staging server back to the now load-balanced production server. Debugged connection problems until 2022-01-31 19:52:04.
issue comment comment
Switched the snowflake-server (at the time running on a load-balanced staging server) for a version with CPU profiling.
Switched the snowflake bridge to a temporary load-balanced staging server. Debugged connection problems until 2022-01-25 18:47:00.
issue comment post comment
Increased capacity of the mapping to client IP addresses on the snowflake bridge.
issue deployment comment
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
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