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OONI coverage in South Korea

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 19 -2vs previous 30 days
Users covered 93.7% +0.1 ppvs previous 30 days
Measurements 200,935 -16,582vs previous 30 days
Top two networks 46.1% +6.5 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
AS4766 AS4766KIXS-AS-KR-KR - Korea Telecom 46.2% 17.6% 29
AS17858 AS17858POWERVIS-AS-KR-KR - LG POWERCOMM 20.1% 25.4% 30
AS9644 AS9644SKTELECOM-NET-AS-KR - SK Telecom 10.5% 0.2% 2
AS17853 AS17853LGTELECOM-AS-KR-KR - LGTELECOM 6.7% 16.5% 28
AS3786 AS3786LGDACOM-KR - LG DACOM Corporation 4.8% 2.3% 19
AS9316 AS9316DACOM-PUBNETPLUS-AS-KR-KR - DACOM-PUBNETPLUS 2.6% 8.4% 19
AS9318 AS9318SKB-AS-KR - SK Broadband Co Ltd 1.6% 20.7% 28
AS10036 AS10036CNM-AS-KR-KR - DLIVE 1.0% 0.0% 0
AS16509 AS16509AMAZON-02 - Amazon.com, Inc. 0.6% <0.1% 2
AS9845 AS9845CJCKN-AS-KR-KR - LG HelloVision Corp. 0.3% 0.0% 0

Networks without measurements

15 networks with at least 0.1% of users had no measurements in the last 30 days, about 3.2% of users in total.

ASNNameUsers
AS10036 AS10036CNM-AS-KR-KR - DLIVE 1.02%
AS9845 AS9845CJCKN-AS-KR-KR - LG HelloVision Corp. 0.27%
AS9694 AS9694SEOKYUNG-CATV-AS-KR-KR - Seokyung Cable Television Co.. Ltd. 0.26%
AS45361 AS45361JCN-AS-KR-KR - Ulsan Jung-Ang Broadcasting Network 0.19%
AS10066 AS10066GAYANET-AS-KR-KR - LG HelloVision Corp. 0.18%
AS17839 AS17839DREAMPLUS-AS-KR-KR - LG HelloVision Corp. 0.17%
AS9770 AS9770SPEEDONSTV-AS-KR-KR - LG HelloVision Corp. 0.17%
AS9319 AS9319HCNCHUNGJU-AS-KR-KR - HCN CHUNGBUK CABLE TV SYSTEMS 0.15%

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 networkAS17858AS9318AS4766AS17853AS9316Others
  • AS17858POWERVIS-AS-KR-KR - LG POWERCOMM25.4%
  • AS9318SKB-AS-KR - SK Broadband Co Ltd20.7%
  • AS4766KIXS-AS-KR-KR - Korea Telecom17.6%
  • AS17853LGTELECOM-AS-KR-KR - LGTELECOM16.5%
  • AS9316DACOM-PUBNETPLUS-AS-KR-KR - DACOM-PUBNETPLUS8.4%
  • Others11.4%

2 more networks are not in APNIC's user estimates and account for 1.3% 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 8,1682026/08/11 Anomaly 3672026/08/11 Confirmed 362026/08/11 Failure 3412026/08/12 OK 9,0722026/08/12 Anomaly 3062026/08/12 Confirmed 42026/08/12 Failure 5622026/08/13 OK 10,9492026/08/13 Anomaly 5072026/08/13 Confirmed 402026/08/13 Failure 6362026/08/14 OK 7,8982026/08/14 Anomaly 3202026/08/14 Confirmed 42026/08/14 Failure 3562026/08/15 OK 8,4752026/08/15 Anomaly 3662026/08/15 Confirmed 102026/08/15 Failure 4832026/08/16 OK 9,5562026/08/16 Anomaly 3462026/08/16 Confirmed 42026/08/16 Failure 4412026/08/17 OK 10,6292026/08/17 Anomaly 4192026/08/17 Confirmed 312026/08/17 Failure 4252026/08/18 OK 11,1022026/08/18 Anomaly 5292026/08/18 Confirmed 72026/08/18 Failure 7432026/08/19 OK 7,7262026/08/19 Anomaly 3212026/08/19 Confirmed 352026/08/19 Failure 4582026/08/20 OK 7,7072026/08/20 Anomaly 4532026/08/20 Confirmed 122026/08/20 Failure 5752026/08/21 OK 4,4952026/08/21 Anomaly 1922026/08/21 Confirmed 52026/08/21 Failure 2112026/08/22 OK 5,9802026/08/22 Anomaly 1632026/08/22 Confirmed 422026/08/22 Failure 2932026/08/23 OK 7,1472026/08/23 Anomaly 1972026/08/23 Confirmed 62026/08/23 Failure 3162026/08/24 OK 4,8542026/08/24 Anomaly 1982026/08/24 Confirmed 82026/08/24 Failure 5122026/08/25 OK 5,6412026/08/25 Anomaly 2772026/08/25 Confirmed 92026/08/25 Failure 4602026/08/26 OK 6,9102026/08/26 Anomaly 2382026/08/26 Confirmed 552026/08/26 Failure 4122026/08/27 OK 4,2752026/08/27 Anomaly 1892026/08/27 Confirmed 52026/08/27 Failure 3062026/08/28 OK 5,8052026/08/28 Anomaly 1632026/08/28 Confirmed 42026/08/28 Failure 3192026/08/29 OK 4,4412026/08/29 Anomaly 1452026/08/29 Confirmed 162026/08/29 Failure 4942026/08/30 OK 5,1432026/08/30 Anomaly 1342026/08/30 Confirmed 122026/08/30 Failure 4322026/08/31 OK 7,1432026/08/31 Anomaly 2212026/08/31 Confirmed 42026/08/31 Failure 5112026/09/01 OK 3,5012026/09/01 Anomaly 982026/09/01 Confirmed 62026/09/01 Failure 3692026/09/02 OK 4,7052026/09/02 Anomaly 1442026/09/02 Confirmed 52026/09/02 Failure 2502026/09/03 OK 7,6022026/09/03 Anomaly 4502026/09/03 Confirmed 32026/09/03 Failure 4362026/09/04 OK 5,4942026/09/04 Anomaly 1672026/09/04 Confirmed 02026/09/04 Failure 3802026/09/05 OK 5,2272026/09/05 Anomaly 1662026/09/05 Confirmed 142026/09/05 Failure 4042026/09/06 OK 4,1922026/09/06 Anomaly 1162026/09/06 Confirmed 52026/09/06 Failure 1932026/09/07 OK 3,6532026/09/07 Anomaly 1212026/09/07 Confirmed 132026/09/07 Failure 3382026/09/08 OK 5,2122026/09/08 Anomaly 1802026/09/08 Confirmed 72026/09/08 Failure 3232026/09/09 OK 4,6452026/09/09 Anomaly 1292026/09/09 Confirmed 22026/09/09 Failure 1652026/09/10 OK 4,8992026/09/10 Anomaly 1632026/09/10 Confirmed 182026/09/10 Failure 2932026/09/11 OK 5,8932026/09/11 Anomaly 2502026/09/11 Confirmed 192026/09/11 Failure 1,5462026/09/12 OK 3,9972026/09/12 Anomaly 1252026/09/12 Confirmed 62026/09/12 Failure 2702026/09/13 OK 4,5942026/09/13 Anomaly 1222026/09/13 Confirmed 02026/09/13 Failure 982026/09/14 OK 3,7642026/09/14 Anomaly 842026/09/14 Confirmed 02026/09/14 Failure 512026/09/15 OK 3,2002026/09/15 Anomaly 1012026/09/15 Confirmed 42026/09/15 Failure 1062026/09/16 OK 5,2092026/09/16 Anomaly 1992026/09/16 Confirmed 02026/09/16 Failure 1332026/09/17 OK 4,6122026/09/17 Anomaly 1122026/09/17 Confirmed 12026/09/17 Failure 1452026/09/18 OK 3,6432026/09/18 Anomaly 1032026/09/18 Confirmed 42026/09/18 Failure 562026/09/19 OK 4,4562026/09/19 Anomaly 1572026/09/19 Confirmed 372026/09/19 Failure 2152026/09/20 OK 6,0922026/09/20 Anomaly 1872026/09/20 Confirmed 62026/09/20 Failure 1852026/09/21 OK 5,9022026/09/21 Anomaly 2352026/09/21 Confirmed 62026/09/21 Failure 2232026/09/22 OK 6,8692026/09/22 Anomaly 3132026/09/22 Confirmed 02026/09/22 Failure 2872026/09/23 OK 8,3762026/09/23 Anomaly 3922026/09/23 Confirmed 42026/09/23 Failure 2982026/09/24 OK 5,4892026/09/24 Anomaly 3012026/09/24 Confirmed 82026/09/24 Failure 2862026/09/25 OK 9,5582026/09/25 Anomaly 4472026/09/25 Confirmed 62026/09/25 Failure 3712026/09/26 OK 8,3102026/09/26 Anomaly 4152026/09/26 Confirmed 82026/09/26 Failure 5212026/09/27 OK 7,9332026/09/27 Anomaly 6542026/09/27 Confirmed 72026/09/27 Failure 4782026/09/28 OK 5,8932026/09/28 Anomaly 3492026/09/28 Confirmed 02026/09/28 Failure 4672026/09/29 OK 5,9462026/09/29 Anomaly 2832026/09/29 Confirmed 32026/09/29 Failure 3562026/09/30 OK 6,5002026/09/30 Anomaly 3242026/09/30 Confirmed 02026/09/30 Failure 2882026/10/01 OK 8,2192026/10/01 Anomaly 4352026/10/01 Confirmed 142026/10/01 Failure 4322026/10/02 OK 7,5302026/10/02 Anomaly 3812026/10/02 Confirmed 32026/10/02 Failure 3872026/10/03 OK 9,2892026/10/03 Anomaly 4122026/10/03 Confirmed 32026/10/03 Failure 4272026/10/04 OK 7,3162026/10/04 Anomaly 3242026/10/04 Confirmed 32026/10/04 Failure 2752026/10/05 OK 10,6962026/10/05 Anomaly 2852026/10/05 Confirmed 02026/10/05 Failure 3852026/10/06 OK 7,2392026/10/06 Anomaly 2172026/10/06 Confirmed 02026/10/06 Failure 3762026/10/07 OK 4,4842026/10/07 Anomaly 1542026/10/07 Confirmed 02026/10/07 Failure 922026/10/08 OK 3,7962026/10/08 Anomaly 1272026/10/08 Confirmed 02026/10/08 Failure 2562026/10/09 OK 3,8792026/10/09 Anomaly 1142026/10/09 Confirmed 32026/10/09 Failure 121
Networks measured per day
051008/1109/1010/092026/08/11 Networks measured 72026/08/12 Networks measured 102026/08/13 Networks measured 102026/08/14 Networks measured 92026/08/15 Networks measured 92026/08/16 Networks measured 92026/08/17 Networks measured 92026/08/18 Networks measured 102026/08/19 Networks measured 102026/08/20 Networks measured 52026/08/21 Networks measured 62026/08/22 Networks measured 52026/08/23 Networks measured 82026/08/24 Networks measured 72026/08/25 Networks measured 62026/08/26 Networks measured 82026/08/27 Networks measured 62026/08/28 Networks measured 72026/08/29 Networks measured 72026/08/30 Networks measured 52026/08/31 Networks measured 62026/09/01 Networks measured 42026/09/02 Networks measured 52026/09/03 Networks measured 72026/09/04 Networks measured 82026/09/05 Networks measured 82026/09/06 Networks measured 62026/09/07 Networks measured 52026/09/08 Networks measured 82026/09/09 Networks measured 82026/09/10 Networks measured 72026/09/11 Networks measured 62026/09/12 Networks measured 82026/09/13 Networks measured 72026/09/14 Networks measured 72026/09/15 Networks measured 52026/09/16 Networks measured 62026/09/17 Networks measured 72026/09/18 Networks measured 72026/09/19 Networks measured 62026/09/20 Networks measured 72026/09/21 Networks measured 72026/09/22 Networks measured 102026/09/23 Networks measured 92026/09/24 Networks measured 52026/09/25 Networks measured 72026/09/26 Networks measured 72026/09/27 Networks measured 62026/09/28 Networks measured 82026/09/29 Networks measured 72026/09/30 Networks measured 82026/10/01 Networks measured 62026/10/02 Networks measured 72026/10/03 Networks measured 102026/10/04 Networks measured 72026/10/05 Networks measured 102026/10/06 Networks measured 92026/10/07 Networks measured 82026/10/08 Networks measured 62026/10/09 Networks measured 5

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 79.72026/08/12 Users covered 77.62026/08/13 Users covered 88.02026/08/14 Users covered 88.02026/08/15 Users covered 82.42026/08/16 Users covered 82.42026/08/17 Users covered 77.62026/08/18 Users covered 88.12026/08/19 Users covered 90.12026/08/20 Users covered 54.62026/08/21 Users covered 74.72026/08/22 Users covered 70.62026/08/23 Users covered 82.22026/08/24 Users covered 77.32026/08/25 Users covered 74.72026/08/26 Users covered 92.72026/08/27 Users covered 79.52026/08/28 Users covered 82.12026/08/29 Users covered 77.32026/08/30 Users covered 28.52026/08/31 Users covered 77.32026/09/01 Users covered 28.52026/09/02 Users covered 74.72026/09/03 Users covered 79.52026/09/04 Users covered 82.82026/09/05 Users covered 77.32026/09/06 Users covered 74.72026/09/07 Users covered 57.22026/09/08 Users covered 87.92026/09/09 Users covered 82.12026/09/10 Users covered 79.52026/09/11 Users covered 79.52026/09/12 Users covered 77.32026/09/13 Users covered 77.32026/09/14 Users covered 91.02026/09/15 Users covered 28.62026/09/16 Users covered 75.92026/09/17 Users covered 82.12026/09/18 Users covered 82.02026/09/19 Users covered 77.32026/09/20 Users covered 82.12026/09/21 Users covered 80.22026/09/22 Users covered 93.32026/09/23 Users covered 82.22026/09/24 Users covered 75.32026/09/25 Users covered 82.02026/09/26 Users covered 68.22026/09/27 Users covered 79.62026/09/28 Users covered 79.62026/09/29 Users covered 74.92026/09/30 Users covered 79.62026/10/01 Users covered 77.42026/10/02 Users covered 77.52026/10/03 Users covered 82.32026/10/04 Users covered 82.22026/10/05 Users covered 82.12026/10/06 Users covered 82.12026/10/07 Users covered 79.52026/10/08 Users covered 74.72026/10/09 Users covered 77.2

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