Users
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.
Related events
The following events have been manually collected on this wiki page and might be related to the displayed graph.
| Dates | Places/Protocols | Description and Links |
|---|---|---|
| 2018-05-08 | meek |
The meek-amazon bridge imposes a rate limit of 1 MB/s.
|
| 2018-04-15 to present | Bridges Unknown |
Doubling of bridge users over about 45 days. Relay users unaffected.
relay graph bridge graph |
| 2018-04-13 | snowflake |
Snowflake client registrations (based on domain fronting) stop working, because of a Google infrastructure change that stops domain fronting from working. The time of the change is between 2018-04-13 14:00:00 and 2018-04-13 18:00:00, based on when the bandwidth graph of the Snowflake bridge 5481936581E23D2D178105D44DB6915AB06BFB7F went to zero.
ticket |
| 2018-04-02 | snowflake |
Reinstated periodic restarts of the fallback snowflake proxies.
comment |
| 2018-03-27 | snowflake |
Restarted the fallback snowflake proxies with no limit on memory.
comment |
| 2018-03-26 | snowflake |
Release of Tor Browser 8.0a5. Improves snowflake client performance.
blog post ticket |
| 2018-03-23 | snowflake |
Restarted the fallback snowflake proxies with a limit on resident memory (ulimit -m) rather than virtual memory (ulimit -v).
comment comment |
| 2018-03-22 | snowflake |
Disabled periodic restarts of the fallback snowflake proxies; gave them a memory limit of 200 MB.
comment |
| 2018-03-22 | snowflake |
Increased memory limit of the fallback snowflake proxies from 200 MB to 400 MB.
comment comment |
| 2018-03-22 | snowflake |
Provisionally increased memory limits of the fallback snowflake proxies to 400 MB, 800 MB, or unlimited.
comment |
| 2018-03-16 | snowflake |
Deployed another attempt to fix frequent crashes of the fallback snowflake proxies.
comment |
| 2018-03-14 | snowflake |
Deployed an attempt to fix frequent crashes of the fallback snowflake proxies.
comment commit |
| 2018-03-03 |
Release of tor 0.3.2.10, 0.3.1.10, and 0.2.9.15, which offer better resistance against DoS attacks.
blog post ticket |
|
| 2018-02-27 to 2018-03-02 |
Less than 3 bandwidth authorities are available.
tor-relays |
|
| 2018-02-12 | Relays |
Tor 0.3.3.2-alpha reaches deb.torproject.org repositories
|
| 2018-02-11 | Relays |
Tor 0.3.3.2-alpha reaches FreeBSD repositories
|
| 2018-02-10 | Relays |
Tor 0.3.3.2-alpha is released (containing important denial-of-service migitations for relays)
blog |
| 2018-02-08 | ipv4 ipv6 |
geoip and geoip6 databases updated to "February 7 2018 Maxmind GeoLite2 Country" (geoip-db-digest FF83AD73DE7672C77EDF8888F4B241642C7C90F7, geoip6-db-digest B1CDBFEB7C88F82EF3B5289CAFEED1321FA4693F).
commit |
| 2018-01-24 to present | webstats |
Tor Browser update pings roughly halve, again. The beginning corresponds with the release of Tor Browser 7.5; however unlike with Tor Browser 6.5.2, there was no change to app.update.url this time.
ticket thread |
| 2018-01-23 | obfs4 |
Tor Browser 7.5 is released. It adds the default obfs4 bridge noisetor01:46089.
blog post |
| 2018-01-20 | Relays |
Some more directory authorities upgrade to 0.3.2.9 which enforces new requirements for the exit flag. ~50 relays lose the exit flag
tor-relays post |
| 2018-01-16 |
Tor 0.3.2.9 reaches deb.torproject.org.
relay versions graph |
|
| 2018-01-08 | ipv4 ipv6 |
geoip and geoip6 databases updated to "January 5 2018 Maxmind GeoLite2 Country" (geoip-db-digest ACE2AF82816B9D3F58FC9C79A41B4506D6DAD713, geoip6-db-digest 387B3F555F1E054F0F9971C726F49848C5B5CF8B).
commit |
| 2018-01-05 to present |
Outage of the op-hk OnionPerf instance.
op-hk graph |
|
| 2017-12-21 |
Release of tor 0.3.2.8-rc, intended to fix the KIST bug that enabled a DoS on relays by running them out of memory.
announcement ticket |
|
| 2017-12-20 | ipv4 ipv6 |
geoip and geoip6 databases updated to "December 6 2017 Maxmind GeoLite2 Country" (geoip-db-digest 1D486694A710145631B295CC39ECC5682F75858C, geoip6-db-digest F33231CAC761A71F7C19273DB1E11CEE01E2D982).
commit |
| 2017-12-16 to 2017-12-17 | Bridges Unknown |
Drop in the number of measured bridges.
graph mailing list post |
| 2017-12-12 to 2018-01-18 | meek |
Outage of the meek.bamsoftware.com (unthrottled for public use), meek.bamsoftware.com:7443 (former meek-azure, now unused), and gaeuploader.meek.bamsoftware.com (used by GAEuploader) bridges.
|
| 2017-12-09 | <OR> ipv6 Relays |
Release of Tor Browser 7.0.11, containing tor 0.3.1.9, which adds an IPv6 address for the bridge authority bastet.
blog post |
| 2017-12-09 | <OR> ipv6 Relays |
Release of Tor Browser 7.5a9, containing tor 0.3.2.6-alpha, which adds an IPv6 address for the bridge authority bastet.
blog post |
| 2017-12-08 to 2017-12-11 | Bridges |
The bridge authority was down for unknown reasons.
graph mailing list post |
| 2017-12-04 to present |
DDoS attack creates load on the network.
tor-relays thread relay graph summary post ticket |
|
| 2017-12-01 | <OR> ipv6 Relays |
Release of tor 0.2.8.17, 0.2.9.14, 0.3.0.13, 0.3.1.9, and 0.3.2.6-alpha, which add an IPv6 address for the bridge authority bastet.
ticket blog post |
| 2017-11-15 | meek |
Outage of meek-amazon bridge.
ticket |
| 2017-11-15 | <OR> Relays |
Release of Tor Browser 7.5a8, containing tor 0.3.2.4-alpha, which adds a new directory authority bastet, and changes the IP address of the directory authority Longclaw.
blog post |
| 2017-11-14 | <OR> Relays |
Release of Tor Browser 7.0.10, containing tor 0.3.1.8, which adds a new directory authority bastet, and changes the IP address of the directory authority Longclaw.
blog post |
| 2017-11-11 to 2017-11-12 |
Outage of the op-hk OnionPerf instance.
op-hk graph |
|
| 2017-11-10 | ipv4 ipv6 |
geoip and geoip6 databases updated to "November 6 2017 Maxmind GeoLite2 Country" (geoip-db-digest E3C910F3B2A6C916C7BE33A943091EF57048B72C, geoip6-db-digest E8BD5B2E6554C27F718F1222667C09680D75F799).
commit |
| 2017-11-01 | meek |
Turned off the old meek-amazon CDN endpoint d2zfqthxsdq309.cloudfront.net.
mailing list post |
| 2017-10-25 | <OR> Relays |
Release of tor 0.2.5.15, 0.2.8.16, 0.2.9.13, 0.3.0.12, and 0.3.1.8, which add a new directory authority bastet, and change the IP address of the directory authority Longclaw.
blog post Bastet blog post bastet ticket Longclaw ticket |
| 2017-10-14 | snowflake |
Activated client IP address statistics on the Snowflake server and standalone proxies.
comment |
| 2017-10-05 | ipv4 ipv6 |
geoip and geoip6 databases updated to "October 4 2017 Maxmind GeoLite2 Country" (geoip-db-digest 3A59213E5CFEE380F544B72DC1105366C6BD1CDE, geoip6-db-digest 1B8C975E5C62CF0FB5B4E598AE27B7189952BB09).
commit |
| 2017-09-15 to 2017-09-16 | Bridges |
The bridge authority was down due to an issue with its offline master key.
graph mailing list post |
| 2017-09-15 to 2017-10-12 |
Outage of the op-hk OnionPerf instance. Reported timeouts on the tor network increased, download speed improved.
mailing list post torperf graph torperf-failures graph op-hk graph |
|
| 2017-09-14 to 2017-09-16 | Bridges |
Outage of the bridge authority Bifroest.
|
| 2017-09-07 | ipv4 ipv6 |
geoip and geoip6 databases updated to "September 6 2017 Maxmind GeoLite2 Country" (geoip-db-digest 0CE9EA8882EDED265451C36B49AE7BBB06A11C16, geoip6-db-digest C4573496EBD1CC335843067107DA49E482568FF6).
commit |
| 2017-09-02 to 2017-09-21 | obfs4 Unknown |
About a 35% increase in obfs4 users before returning to normal. Happened in many countries. Other transports do not have it.
graph |
| 2017-09-01 to 2017-09-20 | obfs4 |
A flood of over 4,000 obfs4 bridges nicknamed "Machiavelli".
graph of number of bridges tor-relays post metrics-team thread tweet |
| 2017-08-14 to 2017-08-15 | Bridges |
Outage of the bridge authority Bifroest.
mailing list post mailing list post graph |
| 2017-08-14 | ipv6 obfs4 Unknown |
Jump in IPv6 users of the Lisbeth default obfs4 bridge.
comment |
| 2017-08-10 to 2017-08-11 |
Outage of the op-hk OnionPerf instance. Reported timeouts on the tor network increased, download speed improved.
torperf graph torperf-failures graph op-hk graph |
|
| 2017-08-08 | snowflake |
Tor Browser 7.5a4 released, including Snowflake for macOS.
blog post |
| 2017-08-03 | ipv4 ipv6 |
geoip and geoip6 databases updated to "August 3 2017 Maxmind GeoLite2 Country" (geoip-db-digest 75AABD32582AC554AF252DDC7BBBABE7C6F28B28, geoip6-db-digest A52EFFEF8CF6F3CAA8EBD34961361544E959FAE1).
commit |
| 2017-07-31 to 2017-08-28 | Unknown |
Directory authorities using 2× bandwidth.
mailing list post for start mailing list post for end post suggesting link to nl, ro, lt, sc increases |
| 2017-07-29 to 2017-08-17 | meek |
Outage of meek-amazon bridge, caused by an expired certificate.
Atlas expired certificate new certificate |
| 2017-07-07 | ipv4 ipv6 |
geoip and geoip6 databases updated to "July 4 2017 Maxmind GeoLite2 Country" (geoip-db-digest 3D04F191098640F2E03B4D5F7800088D14B7EC30, geoip6-db-digest A3649B9E909C59942FB3D8F874AB4BEA36E8BEC1).
commit |
| 2017-07-04 to 2017-07-21 | obfs4 |
Outage of default obfs4 bridge dragon.
mailing list post |
| 2017-07-04 to 2017-07-21 | obfs4 |
Outage of default obfs4 bridge frosty.
mailing list post |
| 2017-07-02 |
deb.torproject.org upgrades from tor 0.2.9 to tor 0.3.0
relay versions graph tweet |
|
| 2017-06-26 to 2017-07-03 | obfs4 |
Outage of default obfs4 bridge frosty.
mailing list post |
| 2017-06-26 to 2017-07-02 | obfs4 |
Outage of default obfs4 bridge dragon.
mailing list post |
| 2017-06-20 | meek |
Outage of meek-azure bridge.
start end |
| 2017-06-19 to 2017-06-23 | obfs4 |
Outage of default obfs4 bridge dragon.
mailing list post |
| 2017-06-18 to 2017-06-23 | obfs4 |
Outage of default obfs4 bridge frosty.
mailing list post |
| 2017-06-12 | obfs4 |
Increased the file descriptor limit on default obfs4 bridges ndnop3 and ndnop5 from 4096 to 32768. They had been failing bootstrap attempts from a test location in the U.S. about 40% of the time.
graph showing failed connections |
| 2017-06-09 | ipv4 ipv6 |
geoip and geoip6 databases updated to "June 8 2017 Maxmind GeoLite2 Country" (geoip-db-digest AFD609025B66305AD9FA8E0B15AF4F2BC82271F1, geoip6-db-digest A69FD14ACE46EE695F589ACE0EB7B915285B51B4).
commit |
| 2017-06-07 | ipv6 obfs4 |
Tor Browser 7.0 released. Adds an IPv6 address for default obfs4 bridge Lisbeth. Adds new default obfs4 bridges frosty and dragon.
blog post IPv6 ticket frosty and dragon ticket |
| 2017-05-25 | obfs4 |
Set AssumeReachable 1 on the default obfs4 bridges cymrubridge31 and cymrubridge33 in an attempt to make them publish statistics.
mailing list post |
| 2017-05-23 to 2017-06-13 | obfs4 |
Default obfs4 bridge LeifEricson rejects connections due to a broken firewall forwarding rule. This didn't affect the bridges "real" obfs4 port, but it did affect the port at that time configured in Tor Browser.
|
| 2017-05-08 | ipv4 ipv6 |
geoip and geoip6 databases updated to "May 2 2017 Maxmind GeoLite2 Country" (geoip-db-digest B2E5105287668771E34A66F90B34982D419727EF, geoip6-db-digest 8DA8AC3C8158CBFDF7DB53BBF73338246872371A).
commit |
| 2017-04-14 to 2017-08-20 | <OR> |
Directory authority maatuska's bwscanner stops operating, leading to a drop in traffic on some relays.
tor-consensus-health post about start tor-consensus-health post about end tor-dev thread analysis |