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OONI coverage in Japan

OONI's censorship measurements come from volunteers running OONI Probe on their own connections. Within one region, each provider and network (ASN, autonomous system number) may block different sites, so when only one or two providers are measured, blocking on the others goes unrecorded. This page sets OONI's measurement counts against APNIC's estimates of how many users each network has, to show how many users the measurements cover, which networks they concentrate on, and which networks have none.

The page is regenerated every hour and OONI's measurements are read every six hours. Taiwan is shown by default, with other regions as reference points; switch between them with the region list below. Each quarter's changes are written up in the quarterly reports.

Measurements up to 2026-10-09 UTC · user estimates from 2026-10-08

Networks measured 65 +1vs previous 30 days
Users covered 84.2% +0.3 ppvs previous 30 days
Measurements 337,505 -56,098vs previous 30 days
Top two networks 24.9% -13.1 ppvs previous 30 days

Cards show the last 30 days, and the small charts show each day over the last 60. A lower share for the top two networks means the measurements are more spread out.

Networks with the most users

The ten networks with the most users by APNIC's estimates, against their share of measurements and the number of days measured over the last 30 days. Networks with many users and few measurements are where running OONI Probe helps most.

Networks with the most usersUsersMeasured
ASNNameUsersMeasuredDays
AS2516 AS2516KDDI - KDDI CORPORATION 19.7% 6.3% 28
AS17676 AS17676GIGAINFRA - SoftBank Corp. 17.9% 13.8% 30
AS4713 AS4713OCN - NTT DOCOMO BUSINESS,Inc. 11.2% 3.0% 27
AS9605 AS9605docomo - NTT DOCOMO, INC. 6.3% 0.1% 6
AS17511 AS17511OPTAGE - OPTAGE Inc. 4.6% 9.0% 30
AS9824 AS9824JTCL-JP-AS - JCOM Co., Ltd. 4.6% 0.4% 9
AS2518 AS2518BIGLOBE - BIGLOBE Inc. 4.1% 3.1% 24
AS2527 AS2527So-net - Sony Network Communications Inc. 3.8% 6.8% 30
AS18126 AS18126CTCX - Chubu Telecommunications Company, Inc. 2.7% 2.3% 14
AS138384 AS138384RMNI-AS-AP - Rakuten Mobile Network, Inc. 1.6% 0.1% 10

Networks without measurements

29 networks with at least 0.1% of users had no measurements in the last 30 days, about 11.3% of users in total.

ASNNameUsers
AS7679 AS7679QTNET - QTnet,Inc. 1.33%
AS9617 AS9617ZAQ - JCOM Co., Ltd. 1.30%
AS10010 AS10010TOKAI - TOKAI Communications Corporation 1.29%
AS7522 AS7522STCN - STNet, Incorporated 0.87%
AS18081 AS18081KCN - Kintetsu Cable Network Co., Ltd. 0.64%
AS4721 AS4721JCN - JCOM Co., Ltd. 0.58%
AS9354 AS9354TDNC - Community Network Center Inc. 0.54%
AS18144 AS18144AS-ENECOM - Enecom,Inc. 0.51%

Where measurements come from

Each network's share of measurements over the last 30 days. When a few networks account for most of them, the rest can only be judged from scattered data.

Measurements by networkAS17676AS55392AS17511AS18094AS2527Others
  • AS17676GIGAINFRA - SoftBank Corp.13.8%
  • AS55392MF-NATIVE6-W - INTERNET MULTIFEED CO.11.2%
  • AS17511OPTAGE - OPTAGE Inc.9.0%
  • AS18094TCN-AS - Tokyo Cable Network.,INC8.4%
  • AS2527So-net - Sony Network Communications Inc.6.8%
  • Others50.9%

3 more networks are not in APNIC's user estimates and account for 1.6% of measurements; most are academic, hosting, or cloud networks.

Daily measurements

Measurements OONI Probe sends from this region each day, split by result. An anomaly only means the result differs from the control; confirmed blocking has been matched against known blocking patterns.

Measurements per dayOKAnomalyConfirmedFailure
010k20k08/1109/1010/092026/08/11 OK 15,3312026/08/11 Anomaly 3182026/08/11 Confirmed 02026/08/11 Failure 3952026/08/12 OK 17,0812026/08/12 Anomaly 3022026/08/12 Confirmed 02026/08/12 Failure 4302026/08/13 OK 12,7662026/08/13 Anomaly 2672026/08/13 Confirmed 112026/08/13 Failure 4582026/08/14 OK 13,7842026/08/14 Anomaly 2632026/08/14 Confirmed 82026/08/14 Failure 1,2022026/08/15 OK 12,3002026/08/15 Anomaly 3932026/08/15 Confirmed 02026/08/15 Failure 1,3012026/08/16 OK 16,2862026/08/16 Anomaly 4802026/08/16 Confirmed 02026/08/16 Failure 1,5622026/08/17 OK 13,4332026/08/17 Anomaly 3802026/08/17 Confirmed 02026/08/17 Failure 1,4642026/08/18 OK 11,6672026/08/18 Anomaly 2952026/08/18 Confirmed 622026/08/18 Failure 1,3392026/08/19 OK 12,4872026/08/19 Anomaly 2772026/08/19 Confirmed 02026/08/19 Failure 5392026/08/20 OK 15,4842026/08/20 Anomaly 4032026/08/20 Confirmed 12026/08/20 Failure 3612026/08/21 OK 11,8642026/08/21 Anomaly 2912026/08/21 Confirmed 42026/08/21 Failure 5472026/08/22 OK 12,2822026/08/22 Anomaly 2872026/08/22 Confirmed 02026/08/22 Failure 7062026/08/23 OK 11,3642026/08/23 Anomaly 2662026/08/23 Confirmed 02026/08/23 Failure 4282026/08/24 OK 9,4432026/08/24 Anomaly 3282026/08/24 Confirmed 02026/08/24 Failure 4092026/08/25 OK 12,0202026/08/25 Anomaly 2342026/08/25 Confirmed 02026/08/25 Failure 5692026/08/26 OK 7,6642026/08/26 Anomaly 1852026/08/26 Confirmed 02026/08/26 Failure 6352026/08/27 OK 10,7832026/08/27 Anomaly 1422026/08/27 Confirmed 02026/08/27 Failure 2492026/08/28 OK 11,3292026/08/28 Anomaly 2362026/08/28 Confirmed 22026/08/28 Failure 5132026/08/29 OK 9,0432026/08/29 Anomaly 2342026/08/29 Confirmed 02026/08/29 Failure 8222026/08/30 OK 12,1022026/08/30 Anomaly 3282026/08/30 Confirmed 02026/08/30 Failure 6822026/08/31 OK 11,2132026/08/31 Anomaly 3072026/08/31 Confirmed 02026/08/31 Failure 7262026/09/01 OK 11,7552026/09/01 Anomaly 3152026/09/01 Confirmed 282026/09/01 Failure 4162026/09/02 OK 10,8432026/09/02 Anomaly 2472026/09/02 Confirmed 02026/09/02 Failure 3522026/09/03 OK 9,7692026/09/03 Anomaly 1942026/09/03 Confirmed 02026/09/03 Failure 1522026/09/04 OK 17,4722026/09/04 Anomaly 3892026/09/04 Confirmed 12026/09/04 Failure 3262026/09/05 OK 11,9972026/09/05 Anomaly 5122026/09/05 Confirmed 22026/09/05 Failure 5712026/09/06 OK 12,2442026/09/06 Anomaly 3552026/09/06 Confirmed 02026/09/06 Failure 4602026/09/07 OK 10,9532026/09/07 Anomaly 1302026/09/07 Confirmed 02026/09/07 Failure 2292026/09/08 OK 11,4472026/09/08 Anomaly 3322026/09/08 Confirmed 02026/09/08 Failure 3572026/09/09 OK 10,0252026/09/09 Anomaly 1392026/09/09 Confirmed 02026/09/09 Failure 2242026/09/10 OK 11,1982026/09/10 Anomaly 1372026/09/10 Confirmed 02026/09/10 Failure 1302026/09/11 OK 9,3742026/09/11 Anomaly 1252026/09/11 Confirmed 02026/09/11 Failure 1392026/09/12 OK 9,9662026/09/12 Anomaly 3532026/09/12 Confirmed 12026/09/12 Failure 4672026/09/13 OK 11,4102026/09/13 Anomaly 2652026/09/13 Confirmed 22026/09/13 Failure 4442026/09/14 OK 8,4992026/09/14 Anomaly 1622026/09/14 Confirmed 02026/09/14 Failure 1992026/09/15 OK 9,2162026/09/15 Anomaly 2602026/09/15 Confirmed 12026/09/15 Failure 3172026/09/16 OK 10,5022026/09/16 Anomaly 1632026/09/16 Confirmed 02026/09/16 Failure 3612026/09/17 OK 8,4062026/09/17 Anomaly 3362026/09/17 Confirmed 02026/09/17 Failure 4972026/09/18 OK 7,9682026/09/18 Anomaly 922026/09/18 Confirmed 02026/09/18 Failure 2472026/09/19 OK 8,2312026/09/19 Anomaly 1752026/09/19 Confirmed 02026/09/19 Failure 4812026/09/20 OK 11,4422026/09/20 Anomaly 1562026/09/20 Confirmed 02026/09/20 Failure 6212026/09/21 OK 8,6652026/09/21 Anomaly 1522026/09/21 Confirmed 02026/09/21 Failure 5532026/09/22 OK 10,0862026/09/22 Anomaly 1282026/09/22 Confirmed 02026/09/22 Failure 2972026/09/23 OK 11,4662026/09/23 Anomaly 2012026/09/23 Confirmed 02026/09/23 Failure 6632026/09/24 OK 10,9282026/09/24 Anomaly 1372026/09/24 Confirmed 02026/09/24 Failure 3492026/09/25 OK 14,5452026/09/25 Anomaly 2012026/09/25 Confirmed 02026/09/25 Failure 5642026/09/26 OK 11,3482026/09/26 Anomaly 2422026/09/26 Confirmed 02026/09/26 Failure 4232026/09/27 OK 8,9252026/09/27 Anomaly 1082026/09/27 Confirmed 02026/09/27 Failure 4582026/09/28 OK 12,9512026/09/28 Anomaly 1962026/09/28 Confirmed 02026/09/28 Failure 5182026/09/29 OK 8,6912026/09/29 Anomaly 1572026/09/29 Confirmed 02026/09/29 Failure 1,0842026/09/30 OK 13,3022026/09/30 Anomaly 2202026/09/30 Confirmed 02026/09/30 Failure 5462026/10/01 OK 10,2242026/10/01 Anomaly 2222026/10/01 Confirmed 32026/10/01 Failure 3552026/10/02 OK 7,3272026/10/02 Anomaly 752026/10/02 Confirmed 02026/10/02 Failure 3222026/10/03 OK 12,6122026/10/03 Anomaly 2312026/10/03 Confirmed 22026/10/03 Failure 7392026/10/04 OK 8,8882026/10/04 Anomaly 1412026/10/04 Confirmed 02026/10/04 Failure 4562026/10/05 OK 12,4042026/10/05 Anomaly 2322026/10/05 Confirmed 02026/10/05 Failure 7592026/10/06 OK 9,9132026/10/06 Anomaly 1662026/10/06 Confirmed 02026/10/06 Failure 6512026/10/07 OK 13,1122026/10/07 Anomaly 3192026/10/07 Confirmed 02026/10/07 Failure 6092026/10/08 OK 13,3732026/10/08 Anomaly 1772026/10/08 Confirmed 02026/10/08 Failure 9622026/10/09 OK 11,7272026/10/09 Anomaly 3272026/10/09 Confirmed 72026/10/09 Failure 723
Networks measured per day
012.52508/1109/1010/092026/08/11 Networks measured 192026/08/12 Networks measured 202026/08/13 Networks measured 232026/08/14 Networks measured 202026/08/15 Networks measured 192026/08/16 Networks measured 172026/08/17 Networks measured 192026/08/18 Networks measured 242026/08/19 Networks measured 192026/08/20 Networks measured 212026/08/21 Networks measured 192026/08/22 Networks measured 182026/08/23 Networks measured 202026/08/24 Networks measured 192026/08/25 Networks measured 222026/08/26 Networks measured 152026/08/27 Networks measured 152026/08/28 Networks measured 192026/08/29 Networks measured 222026/08/30 Networks measured 192026/08/31 Networks measured 202026/09/01 Networks measured 182026/09/02 Networks measured 242026/09/03 Networks measured 202026/09/04 Networks measured 242026/09/05 Networks measured 192026/09/06 Networks measured 212026/09/07 Networks measured 202026/09/08 Networks measured 172026/09/09 Networks measured 192026/09/10 Networks measured 192026/09/11 Networks measured 182026/09/12 Networks measured 172026/09/13 Networks measured 252026/09/14 Networks measured 192026/09/15 Networks measured 182026/09/16 Networks measured 182026/09/17 Networks measured 192026/09/18 Networks measured 192026/09/19 Networks measured 202026/09/20 Networks measured 162026/09/21 Networks measured 202026/09/22 Networks measured 212026/09/23 Networks measured 212026/09/24 Networks measured 222026/09/25 Networks measured 202026/09/26 Networks measured 212026/09/27 Networks measured 182026/09/28 Networks measured 222026/09/29 Networks measured 222026/09/30 Networks measured 242026/10/01 Networks measured 202026/10/02 Networks measured 232026/10/03 Networks measured 212026/10/04 Networks measured 202026/10/05 Networks measured 252026/10/06 Networks measured 222026/10/07 Networks measured 252026/10/08 Networks measured 252026/10/09 Networks measured 20

Users covered

The share of this region's internet users, by APNIC's estimates, on networks that had at least one measurement that day. One measurement is enough to count, so this is an upper bound rather than a sign that every network is measured enough.

Users covered (%)
05010008/1109/1010/092026/08/11 Users covered 62.42026/08/12 Users covered 70.02026/08/13 Users covered 60.92026/08/14 Users covered 61.42026/08/15 Users covered 68.82026/08/16 Users covered 42.92026/08/17 Users covered 67.12026/08/18 Users covered 57.02026/08/19 Users covered 62.22026/08/20 Users covered 64.52026/08/21 Users covered 64.62026/08/22 Users covered 62.02026/08/23 Users covered 60.62026/08/24 Users covered 68.32026/08/25 Users covered 62.42026/08/26 Users covered 48.32026/08/27 Users covered 62.02026/08/28 Users covered 53.02026/08/29 Users covered 63.52026/08/30 Users covered 65.52026/08/31 Users covered 65.62026/09/01 Users covered 60.32026/09/02 Users covered 75.32026/09/03 Users covered 61.82026/09/04 Users covered 68.12026/09/05 Users covered 50.72026/09/06 Users covered 76.42026/09/07 Users covered 67.22026/09/08 Users covered 64.72026/09/09 Users covered 62.02026/09/10 Users covered 64.02026/09/11 Users covered 62.42026/09/12 Users covered 43.42026/09/13 Users covered 67.82026/09/14 Users covered 59.72026/09/15 Users covered 54.42026/09/16 Users covered 44.42026/09/17 Users covered 61.82026/09/18 Users covered 67.72026/09/19 Users covered 65.62026/09/20 Users covered 64.72026/09/21 Users covered 65.72026/09/22 Users covered 68.02026/09/23 Users covered 53.82026/09/24 Users covered 73.22026/09/25 Users covered 67.62026/09/26 Users covered 69.72026/09/27 Users covered 64.22026/09/28 Users covered 69.92026/09/29 Users covered 64.32026/09/30 Users covered 74.52026/10/01 Users covered 69.32026/10/02 Users covered 76.22026/10/03 Users covered 74.12026/10/04 Users covered 71.62026/10/05 Users covered 71.72026/10/06 Users covered 73.02026/10/07 Users covered 69.82026/10/08 Users covered 73.02026/10/09 Users covered 72.3

Across regions

Users covered by networks measured in the last 30 days, with each day's value over the last 60. Open a region for its full charts.

Taiwan 93.9% Hong Kong 69.4% Macau 85.1% Japan 84.2% South Korea 93.7% Singapore 78.5%

How the numbers are calculated

  • Measurement counts come from OONI's aggregation API, across all tests, grouped by the day each measurement started (UTC)
  • Users per network are APNIC's estimates, derived from ad-based sampling and updated weekly
  • Network names come from the APNIC and RIPE NCC ASN name lists
  • A single measurement is enough for a network to count as measured; whether it is measured enough shows in its share of measurements and the number of days
  • Days without measurements are left as gaps in the charts rather than filled in

Help fill the gaps

  • Install OONI Probe and run tests on your own connection, on a phone or a computer. Mobile data and home broadband are usually different ASNs, so testing on both helps
  • The community's OONI Run link 10328 sets everything up in one tap; see the OONI Run v2 guide for the risks to consider before installing and what the list contains
  • ASN observation data analysis: why network diversity matters and how to read a single measurement
  • ASN Coverage: a command-line tool that downloads raw measurements and breaks them down by network type and blocking method