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OONI coverage in Vietnam

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. The glossary at the end of the page explains the fields. 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 13 ±0vs previous 30 days
Users covered 98.8% -0.3 ppvs previous 30 days
Measurements 268,699 -35,823vs previous 30 days
Top two networks 61.6% +12.3 ppvs previous 30 days

Cards show the last 30 days, and the small charts show each day over the last 60. One measurement is OONI Probe's result for one website or service, so a single run of the website test produces hundreds. Users covered is the share of the region's internet users on networks with measurements. A lower share for the top two networks means the measurements are more spread out. pp means percentage points, the difference between two percentages.

Networks with the most users

The ten networks with the most users by the estimates of APNIC, the registry that allocates IP addresses and ASNs in the Asia Pacific. Users is the network's share of the region's internet users, Measured is its share of the region's measurements over the last 30 days, and Days is how many of those days it had any. Names are copied from registry records; in Taiwan, for example, HINET is Chunghwa Telecom's fixed network and EMOME-NET its mobile network. Networks with many users and few measurements are where running OONI Probe helps most.

Networks with the most usersUsersMeasured
ASNNameUsersMeasuredDays
AS7552 AS7552VIETEL-AS-AP Viettel Group 40.0% 27.0% 30
AS45899 AS45899VNPT-AS-VN VNPT Corp 31.3% 34.6% 30
AS18403 AS18403FPT-VN FPT Telecom Company 20.0% 12.6% 30
AS131429 AS131429MOBIFONE-AS-VN MOBIFONE Corporation 4.6% 1.0% 8
AS24086 AS24086VIETTEL-AS-VN Viettel Corporation 1.7% 7.2% 25
AS45543 AS45543SCTV-AS-VN SaiGon Tourist cable Televition Company 1.1% 6.1% 28
AS13335 AS13335CLOUDFLARENET - Cloudflare, Inc. 0.4% 0.0% 0
AS38247 AS38247VIETNAMOBILE-AS-VN Vietnamobile Telecommunications Joint Stock Company 0.3% 0.0% 0
AS45903 AS45903CMCTELECOM-VN CMC Telecom Infrastructure Company 0.1% <0.1% 2
AS24173 AS24173NETNAM-AS-AP Netnam Company 0.1% 0.6% 4

Networks without measurements

2 networks with at least 0.1% of users had no measurements in the last 30 days, about 0.7% of users in total.

ASNNameUsers
AS13335 AS13335CLOUDFLARENET - Cloudflare, Inc. 0.40%
AS38247 AS38247VIETNAMOBILE-AS-VN Vietnamobile Telecommunications Joint Stock Company 0.31%

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 networkAS45899AS7552AS18403AS140815AS24086Others
  • AS45899VNPT-AS-VN VNPT Corp34.6%
  • AS7552VIETEL-AS-AP Viettel Group27.0%
  • AS18403FPT-VN FPT Telecom Company12.6%
  • AS140815HTTVSERVER-VN HTTVSERVER TECHNOLOGY COMPANY LIMITED10.2%
  • AS24086VIETTEL-AS-VN Viettel Corporation7.2%
  • Others8.4%

Daily measurements

Measurements OONI Probe sends from this region each day, split by result. OK means the result matched the control. An anomaly means it did not, which can be blocking but also an unstable connection or a problem with the site itself. Confirmed blocking is an anomaly that matches a known blocking pattern, such as a redirect to a block page. Failure means the test did not complete, for example because the connection dropped midway.

Measurements per dayOKAnomalyConfirmedFailure
010k20k08/1109/1010/092026/08/11 OK 10,2582026/08/11 Anomaly 3412026/08/11 Confirmed 02026/08/11 Failure 5672026/08/12 OK 8,0872026/08/12 Anomaly 2262026/08/12 Confirmed 02026/08/12 Failure 1922026/08/13 OK 9,6742026/08/13 Anomaly 2952026/08/13 Confirmed 02026/08/13 Failure 3042026/08/14 OK 10,5052026/08/14 Anomaly 2702026/08/14 Confirmed 02026/08/14 Failure 3142026/08/15 OK 10,6892026/08/15 Anomaly 3352026/08/15 Confirmed 02026/08/15 Failure 4852026/08/16 OK 8,5292026/08/16 Anomaly 2812026/08/16 Confirmed 02026/08/16 Failure 2922026/08/17 OK 7,9612026/08/17 Anomaly 2372026/08/17 Confirmed 02026/08/17 Failure 2532026/08/18 OK 10,5402026/08/18 Anomaly 4852026/08/18 Confirmed 12026/08/18 Failure 2782026/08/19 OK 11,6082026/08/19 Anomaly 4272026/08/19 Confirmed 02026/08/19 Failure 3252026/08/20 OK 10,7442026/08/20 Anomaly 3782026/08/20 Confirmed 02026/08/20 Failure 2582026/08/21 OK 12,7052026/08/21 Anomaly 3962026/08/21 Confirmed 02026/08/21 Failure 2002026/08/22 OK 11,5282026/08/22 Anomaly 4502026/08/22 Confirmed 12026/08/22 Failure 2322026/08/23 OK 8,8732026/08/23 Anomaly 3492026/08/23 Confirmed 02026/08/23 Failure 1952026/08/24 OK 10,8282026/08/24 Anomaly 3872026/08/24 Confirmed 02026/08/24 Failure 2502026/08/25 OK 10,2832026/08/25 Anomaly 5402026/08/25 Confirmed 02026/08/25 Failure 5672026/08/26 OK 7,3272026/08/26 Anomaly 2692026/08/26 Confirmed 12026/08/26 Failure 1862026/08/27 OK 8,7092026/08/27 Anomaly 3882026/08/27 Confirmed 02026/08/27 Failure 3762026/08/28 OK 8,2322026/08/28 Anomaly 2892026/08/28 Confirmed 02026/08/28 Failure 1982026/08/29 OK 8,9932026/08/29 Anomaly 3602026/08/29 Confirmed 12026/08/29 Failure 1982026/08/30 OK 8,6802026/08/30 Anomaly 3052026/08/30 Confirmed 02026/08/30 Failure 1552026/08/31 OK 10,7662026/08/31 Anomaly 3812026/08/31 Confirmed 02026/08/31 Failure 2432026/09/01 OK 8,7212026/09/01 Anomaly 3262026/09/01 Confirmed 02026/09/01 Failure 2532026/09/02 OK 8,3652026/09/02 Anomaly 3982026/09/02 Confirmed 02026/09/02 Failure 2992026/09/03 OK 9,4542026/09/03 Anomaly 4062026/09/03 Confirmed 02026/09/03 Failure 2382026/09/04 OK 10,1582026/09/04 Anomaly 3692026/09/04 Confirmed 02026/09/04 Failure 1902026/09/05 OK 10,2912026/09/05 Anomaly 4692026/09/05 Confirmed 02026/09/05 Failure 2822026/09/06 OK 8,4922026/09/06 Anomaly 4192026/09/06 Confirmed 02026/09/06 Failure 2172026/09/07 OK 8,6942026/09/07 Anomaly 3712026/09/07 Confirmed 02026/09/07 Failure 2552026/09/08 OK 7,7642026/09/08 Anomaly 3092026/09/08 Confirmed 02026/09/08 Failure 2252026/09/09 OK 8,0362026/09/09 Anomaly 3012026/09/09 Confirmed 02026/09/09 Failure 2402026/09/10 OK 7,6652026/09/10 Anomaly 3002026/09/10 Confirmed 02026/09/10 Failure 2222026/09/11 OK 7,9242026/09/11 Anomaly 3132026/09/11 Confirmed 02026/09/11 Failure 2152026/09/12 OK 11,1212026/09/12 Anomaly 4092026/09/12 Confirmed 02026/09/12 Failure 2382026/09/13 OK 12,7372026/09/13 Anomaly 4632026/09/13 Confirmed 12026/09/13 Failure 2402026/09/14 OK 8,7282026/09/14 Anomaly 3452026/09/14 Confirmed 02026/09/14 Failure 2212026/09/15 OK 8,2862026/09/15 Anomaly 3242026/09/15 Confirmed 02026/09/15 Failure 2652026/09/16 OK 10,2112026/09/16 Anomaly 3072026/09/16 Confirmed 12026/09/16 Failure 2462026/09/17 OK 11,7072026/09/17 Anomaly 3682026/09/17 Confirmed 02026/09/17 Failure 2692026/09/18 OK 8,0872026/09/18 Anomaly 3252026/09/18 Confirmed 02026/09/18 Failure 1462026/09/19 OK 12,0472026/09/19 Anomaly 4122026/09/19 Confirmed 02026/09/19 Failure 1912026/09/20 OK 9,6322026/09/20 Anomaly 3432026/09/20 Confirmed 02026/09/20 Failure 1852026/09/21 OK 8,5752026/09/21 Anomaly 2572026/09/21 Confirmed 02026/09/21 Failure 1562026/09/22 OK 7,9212026/09/22 Anomaly 2852026/09/22 Confirmed 02026/09/22 Failure 1892026/09/23 OK 7,5992026/09/23 Anomaly 2872026/09/23 Confirmed 02026/09/23 Failure 2362026/09/24 OK 9,8382026/09/24 Anomaly 3412026/09/24 Confirmed 02026/09/24 Failure 3052026/09/25 OK 7,0792026/09/25 Anomaly 2632026/09/25 Confirmed 02026/09/25 Failure 2042026/09/26 OK 7,3722026/09/26 Anomaly 3532026/09/26 Confirmed 02026/09/26 Failure 4922026/09/27 OK 7,8052026/09/27 Anomaly 3562026/09/27 Confirmed 02026/09/27 Failure 1982026/09/28 OK 7,9792026/09/28 Anomaly 2942026/09/28 Confirmed 02026/09/28 Failure 2182026/09/29 OK 8,4872026/09/29 Anomaly 3232026/09/29 Confirmed 02026/09/29 Failure 7442026/09/30 OK 8,3102026/09/30 Anomaly 3152026/09/30 Confirmed 02026/09/30 Failure 2032026/10/01 OK 8,1392026/10/01 Anomaly 3112026/10/01 Confirmed 02026/10/01 Failure 1892026/10/02 OK 6,2822026/10/02 Anomaly 2172026/10/02 Confirmed 02026/10/02 Failure 1962026/10/03 OK 12,1782026/10/03 Anomaly 4602026/10/03 Confirmed 02026/10/03 Failure 3152026/10/04 OK 5,0852026/10/04 Anomaly 1482026/10/04 Confirmed 02026/10/04 Failure 1082026/10/05 OK 6,4152026/10/05 Anomaly 2332026/10/05 Confirmed 02026/10/05 Failure 1812026/10/06 OK 5,2952026/10/06 Anomaly 2552026/10/06 Confirmed 02026/10/06 Failure 1942026/10/07 OK 7,5382026/10/07 Anomaly 2712026/10/07 Confirmed 02026/10/07 Failure 2202026/10/08 OK 6,3082026/10/08 Anomaly 2292026/10/08 Confirmed 02026/10/08 Failure 1672026/10/09 OK 5,9552026/10/09 Anomaly 1992026/10/09 Confirmed 02026/10/09 Failure 133
Networks measured per day
051008/1109/1010/092026/08/11 Networks measured 82026/08/12 Networks measured 72026/08/13 Networks measured 72026/08/14 Networks measured 82026/08/15 Networks measured 72026/08/16 Networks measured 62026/08/17 Networks measured 82026/08/18 Networks measured 72026/08/19 Networks measured 92026/08/20 Networks measured 72026/08/21 Networks measured 72026/08/22 Networks measured 72026/08/23 Networks measured 62026/08/24 Networks measured 82026/08/25 Networks measured 82026/08/26 Networks measured 72026/08/27 Networks measured 72026/08/28 Networks measured 62026/08/29 Networks measured 62026/08/30 Networks measured 62026/08/31 Networks measured 62026/09/01 Networks measured 62026/09/02 Networks measured 72026/09/03 Networks measured 72026/09/04 Networks measured 62026/09/05 Networks measured 72026/09/06 Networks measured 62026/09/07 Networks measured 72026/09/08 Networks measured 62026/09/09 Networks measured 72026/09/10 Networks measured 72026/09/11 Networks measured 72026/09/12 Networks measured 62026/09/13 Networks measured 72026/09/14 Networks measured 72026/09/15 Networks measured 52026/09/16 Networks measured 62026/09/17 Networks measured 62026/09/18 Networks measured 62026/09/19 Networks measured 72026/09/20 Networks measured 72026/09/21 Networks measured 62026/09/22 Networks measured 62026/09/23 Networks measured 52026/09/24 Networks measured 52026/09/25 Networks measured 62026/09/26 Networks measured 72026/09/27 Networks measured 52026/09/28 Networks measured 52026/09/29 Networks measured 52026/09/30 Networks measured 52026/10/01 Networks measured 72026/10/02 Networks measured 62026/10/03 Networks measured 82026/10/04 Networks measured 42026/10/05 Networks measured 42026/10/06 Networks measured 62026/10/07 Networks measured 42026/10/08 Networks measured 42026/10/09 Networks measured 6

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 97.72026/08/12 Users covered 97.72026/08/13 Users covered 97.72026/08/14 Users covered 98.02026/08/15 Users covered 98.62026/08/16 Users covered 94.02026/08/17 Users covered 94.22026/08/18 Users covered 94.22026/08/19 Users covered 94.22026/08/20 Users covered 94.22026/08/21 Users covered 94.22026/08/22 Users covered 94.12026/08/23 Users covered 94.02026/08/24 Users covered 98.62026/08/25 Users covered 98.62026/08/26 Users covered 98.62026/08/27 Users covered 94.02026/08/28 Users covered 94.02026/08/29 Users covered 94.02026/08/30 Users covered 94.02026/08/31 Users covered 94.02026/09/01 Users covered 94.02026/09/02 Users covered 94.02026/09/03 Users covered 98.62026/09/04 Users covered 94.02026/09/05 Users covered 94.02026/09/06 Users covered 94.02026/09/07 Users covered 96.92026/09/08 Users covered 94.02026/09/09 Users covered 98.62026/09/10 Users covered 94.02026/09/11 Users covered 98.62026/09/12 Users covered 94.02026/09/13 Users covered 98.62026/09/14 Users covered 98.62026/09/15 Users covered 93.02026/09/16 Users covered 94.02026/09/17 Users covered 94.02026/09/18 Users covered 94.02026/09/19 Users covered 98.62026/09/20 Users covered 94.02026/09/21 Users covered 98.62026/09/22 Users covered 94.02026/09/23 Users covered 94.02026/09/24 Users covered 94.02026/09/25 Users covered 94.02026/09/26 Users covered 98.62026/09/27 Users covered 94.02026/09/28 Users covered 94.02026/09/29 Users covered 94.02026/09/30 Users covered 94.02026/10/01 Users covered 94.12026/10/02 Users covered 94.12026/10/03 Users covered 94.22026/10/04 Users covered 91.32026/10/05 Users covered 92.32026/10/06 Users covered 97.02026/10/07 Users covered 92.32026/10/08 Users covered 92.32026/10/09 Users covered 98.6

Steady coverage

Coverage counts a network as soon as it has a single measurement, even if it was measured on only a day or two. Steady coverage counts only networks measured on at least 15 of the last 30 days. The wider the gap between the two, the more users sit on networks with only scattered measurements.

Users covered 98.8% Measured on at least one day
Users steadily covered 94.0% Measured on at least 15 days

Messaging app tests

OONI Probe tests whether the servers of Signal, WhatsApp and Telegram can be reached. An anomaly only means the result differed from what was expected, which an unstable connection can also cause. An anomaly rate close to 100% usually means the app is blocked there. Rates are left out when there were fewer than 30 measurements in the last 30 days.

Anomaly rate in Vietnam, last 30 days
  • Signal<0.1%
  • WhatsApp<0.1%
  • Telegram0.2%

Up to 2,305 measurements per app

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% Vietnam 98.8% Thailand 97.1% Malaysia 97.9% Indonesia 79.8% Philippines 90.3% India 91.3%
RegionCoveredSteady
Taiwan 93.9% 68.0%
Hong Kong 69.4% 31.2%
Macau 85.1% 0.0%
Japan 84.2% 64.0%
South Korea 93.7% 82.1%
Singapore 78.5% 30.8%
Vietnam 98.8% 94.0%
Thailand 97.1% 92.8%
Malaysia 97.9% 95.1%
Indonesia 79.8% 70.2%
Philippines 90.3% 86.8%
India 91.3% 86.5%

Messaging app anomaly rates across regions

Anomaly rates over the last 30 days, with rates above half highlighted. The last rows are reference regions without their own pages, which have records of blocking to compare against.

RegionSignalWhatsAppTelegram
Taiwan 1.3%1.6%1.4%
Hong Kong 0.7%0.8%0.4%
Macau –––
Japan 0.5%0.8%0.6%
South Korea 0.3%1.7%2.5%
Singapore 1.0%0.4%0.1%
Vietnam <0.1%<0.1%0.2%
Thailand 0.3%0.2%0.1%
Malaysia 0.1%0.2%1.0%
Indonesia 3.4%0.4%0.6%
Philippines 0.3%0.2%1.8%
India 2.1%0.5%1.7%
Reference regions
China 98.2%98.3%98.6%
Myanmar 96.2%99.0%0.6%
Cambodia 21.8%27.5%2.4%
Pakistan 97.0%0.9%99.1%
Bangladesh 0.3%<0.1%0.1%

Glossary

  • OONI Probe: an open-source app from OONI that tests from a phone or computer whether websites and services can be reached, with the results published in OONI's database
  • Measurement: one result of OONI Probe testing one website or service. A single run of the website test produces hundreds, so a high count does not mean many people ran tests
  • Autonomous system (ASN): a group of networks run by one organisation under one routing policy, such as a telecom, a university or a cloud provider, each with its own AS number. A telecom's fixed and mobile networks are often separate ASNs
  • Network names: copied from APNIC and RIPE NCC registry records and often abbreviated. In Taiwan, for example, HINET is Chunghwa Telecom's fixed network and EMOME-NET its mobile network
  • APNIC: the Asia Pacific Network Information Centre, which allocates IP addresses and ASNs in the region and estimates each network's users from sampled web ads
  • Users, Measured (%): Users is the network's share of the region's internet users, and Measured is its share of the region's measurements. The further apart the two are, the more the measurements are out of proportion to the users
  • Days: how many of the last 30 days had any measurements
  • Users covered: the share of the region's internet users on networks with measurements, where a single measurement is enough to count
  • Users steadily covered: counts only networks measured on at least 15 of the last 30 days
  • Top two networks: the share of measurements from the two most measured networks; lower means more spread out
  • pp (percentage points): the difference between two percentages. Coverage going from 94.6% to 93.9% is written as −0.7 pp
  • OK, anomaly, confirmed, failure: OK means the result matched the control. An anomaly means it did not, which can be blocking or an unstable connection. Confirmed blocking is an anomaly matching a known blocking pattern. A failure is a test that did not complete
  • Anomaly rate (messaging apps): the share of the app's measurements that were anomalies. Close to 100% usually means the app is blocked there
  • Reference region: a region without its own page, listed in a comparison table for contrast

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
  • Steady coverage counts only networks measured on at least 15 of the last 30 days
  • Messaging app results also come from the OONI aggregation API, counted by region; the reference regions at the end of the table have no pages of their own
  • 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