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|
geoip and geoip6 databases updated to "August 7 2018 Maxmind GeoLite2 Country" (
|2018-08-04 to 2018-08-05||
Collector was missing consensuses. They were recovered via recent relay consensus diffs.
metrics-team thread tor-relays thread
The estimated number of bridge users becomes available again, following the introduction of the new bridge authority Serge on 2018-07-13. The stats took about a week to reappear because of the discontinuity in bridge reporting affecting the estimated fraction of reporting bridges.
mailing list post graph
|2018-07-20 to 2019-05-02||onion Unknown||
The number of v2 onion services increases from 70k to 100k.
Made the Snowflake bridge report to the new Serge bridge authority.
Release of Tor 0.2.9.16, 0.3.2.11, 0.3.3.9, and 0.3.4.5-rc. Switches bridge authority from Bifroest to Serge. The number of bridges begins counting up from zero as bridges are upgraded. The estimated number of bridge users remained unavailable until 2018-07-21 because of the discontinuity.
announcement ticket blog post number of bridges graph
|2018-07-14 to 2018-07-25||Iraq||
Protests, Internet shutdowns, and social media blocks in Iraq.
relay graph NetBlocks post NRT article about end Psiphon users
The replacement bridge authority Serge begins publishing bridge descriptors.
ticket ticket number of bridges graph
The bridge authority Bifroest stops publishing bridge descriptors. Bridge stats are unavailable until 2018-07-13 and the introduction of a new bridge authority.
ticket ticket mailing list post number of bridges graph
geoip and geoip6 databases updated to "July 3 2018 Maxmind GeoLite2 Country" (
|2018-07-04 to 2018-07-06||snowflake||
Outage of the Snowflake bridge, caused by a full disk.
Release of Tor Browser 8.0a9 with non-working meek.
blog post ticket
|2018-06-24 to 2018-07-06||snowflake||
Metrics for Snowflake are missing, for unknown reasons. The gap is nearly contemporaneous with the gap the measurements for all transports/bridges caused by Bifroest–Serge bridge authority switchover, but starts about 2 weeks earlier in Snowflake's case.
geoip and geoip6 databases updated to "June 7 2018 Maxmind GeoLite2 Country" (
Release of Tor Browser 8.0a8, removes meek-amazon option.
Release of Tor Browser 7.5.5, removes meek-amazon option.
|2018-05-23 to 2018-07-01||Bridges Unknown||
Sharp increase in bridge users in many unrelated countries, affecting even the global aggregate. Relay users unaffected. The graphs reach a peak around 2018-06-07 and then begin falling again. An incomplete sampling of affected countries: Bangladesh Chile Indonesia Morocco Venezuela.
relay graph bridge graph
|2018-05-22 to 2018-06-08||Iraq obfs4 Unknown||
Increase in obfs4 users in Iraq, followed by a slow decrease. No matching change in relay users or other transports.
|2018-04-25 to 2018-07-02||onion Unknown||
The number of v2 onion services increases from 70k to 120k.
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.