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 in the metrics-timeline Git repository and might be related to the displayed graph.
The manually collected events in this table do not necessarily match the automatically generated possible censorship events shown in the graph.
|Dates||Places/Protocols||Description and Links|
Failure of network equipment at site of op-ab OnionPerf instance (equipment now replaced)
onionperf timeouts graph
Release of Tor Browser 9.0a1, removes support for FTE.
blog post ticket
geoip and geoip6 databases updated to "May 13 2019 Maxmind GeoLite2 Country" (
|2019-05-16 to 2019-06-23||Iran Relays||
Tor becomes directly accessible in Iran, leading to an explosion in relay users up to about 1.5 million, before being blocked again.
ticket comment about end tor-talk thread Reddit thread comment Reddit thread
Network equipment failure at site of op-ab OnionPerf instance
Tor browser update pings roughly double.
graph metrics-team thread
Outage of Snowflake fallback proxy-go instances, caused by a failure to restart after segregating old logs.
geoip and geoip6 databases updated to "April 2 2019 Maxmind GeoLite2 Country" (
Outage of the Snowflake broker, caused by a full disk.
geoip and geoip6 databases updated to "March 4 2019 Maxmind GeoLite2 Country" (
|2018-07-20 to 2019-05-02||onion Unknown||
The number of v2 onion services increases from 70k to 100k.
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.