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|
Release of tor 0.3.5.7, 0.3.4.10, and 0.3.3.11. Fixes the bug, present since 0.3.5.1-alpha/0.3.4.1-alpha, of idle bridges being unuseful.
comment ticket blog post ticket
geoip and geoip6 databases updated to "January 3 2019 Maxmind GeoLite2 Country" (
|2018-12-20 to present||Sudan||
Protests and social media blocks in Sudan.
relay graph Access Now post Psiphon users
geoip and geoip6 databases updated to "December 5 2018 Maxmind GeoLite2 Country" (
|2018-11-26 to 2018-11-28||
Outage of the onionperf-us instance, caused by a Greenhost east coast VPS migration.
mailing list post
|2018-11-26 to 2018-11-28||flashproxy||
Outage of the flash proxy badge hosting server, flashproxy.bamsoftware.com, caused by a Greenhost east coast VPS migration.
|2018-11-19 to 2018-11-27||
Slow-running processes on the metrics host cause an observed drop in the overall relay bandwidth graph.
mailing list thread
|2018-11-16 to 2018-11-22||snowflake||
A full disk stops the Snowflake bridge and fallback proxies from working.
|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.