Internet outage in Vietnam

Voidly Research

Active Incident

Internet outage in Vietnam

Vietnam · March 22, 2026 · Ongoing

IODA detected significant connectivity drop in Vietnam. 2 critical alerts recorded. CenAlert confirms censorship activity.

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Evidence

89%

Anomaly Rate

2

Measurements

67%

Confidence

What This Means

89% of 2 network tests from Vietnam failed to reach these services. Global baseline failure rate is typically 1-3%. This 86+ percentage point difference strongly indicates intentional blocking.

How We Detected This

Data Sourceioda + censoredplanet

ML ModelGradientBoosting v3.3 (LOCO median F1 0.87, honest across 127 countries)

Confidence Score67% certainty of censorship

Detection TimeMarch 22, 2026

Full methodology →

Corroborating Evidence (24)

Evidence collected from multiple independent sources. Upstream claims shown in quotes are not Voidly assertions.

IODAInternet Outage Detection & Analysis2 records

outage

"IODA detected critical level outage for Ha Noi"— IODA report

Signal value: 0.88

Mar 22, 2026

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outage

"IODA detected critical level outage for Hồ Chí Minh city"— IODA report

Signal value: 0.89

Mar 22, 2026

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Censored PlanetUniversity of Michigan research22 records

dns-blocking

"DNS blocking detected: 3/3 probes anomalous (100.0%) for bbc.com"— Censored Planet report

Signal value: 1.00

Mar 22, 2026

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dns-blocking

"DNS blocking detected: 4/4 probes anomalous (100.0%) for binance.com"— Censored Planet report

Signal value: 1.00

Mar 22, 2026

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dns-blocking

"DNS blocking detected: 3/3 probes anomalous (100.0%) for facebook.com"— Censored Planet report

Signal value: 1.00

Mar 22, 2026

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dns-blocking

"DNS blocking detected: 3/3 probes anomalous (100.0%) for getlantern.org"— Censored Planet report

Signal value: 1.00

Mar 22, 2026

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dns-blocking

"DNS blocking detected: 3/3 probes anomalous (100.0%) for google.com"— Censored Planet report

Signal value: 1.00

Mar 22, 2026

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+ 17 more Censored Planet records

Affected Services (17)

BBCFacebookInstagramLanternMediumNew York TimesProton VPNProtonVPNPsiphonSignalTelegramThe GuardianTikTokTwitter/XWhatsAppXYouTube

Blocked Domains (22)

bbc.com binance.com facebook.com getlantern.org google.com instagram.com medium.com nytimes.com pornhub.com protonvpn.com psiphon.ca reddit.com signal.org substack.com telegram.org theguardian.com tiktok.com tumblr.com twitter.com whatsapp.comand 2 more

Click any domain to view raw OONI measurements

What we cannot say

Who caused it — measurement data alone does not attribute this to any government, ISP, or other actor.
Intent — anomalous or unreachable measurements indicate interference, not a stated motive or a deliberate-vs-incidental determination.
Which networks — no specific ASN/ISP is identified for this incident.
The mechanism — we cannot state whether this was DNS tampering, TLS/SNI reset, an HTTP blockpage, throttling, or an infrastructure outage.
A confirmed duration — we report the observation window, not a verified start/stop of any block.
Sub-national scope — measurement is aggregated at the country level; we cannot localize to a province, city, or network segment.

Cite This Incident

Voidly Research. (2026). Internet outage in Vietnam [VN-2026-0064]. Voidly Global Censorship Index. https://voidly.ai/incident/VN-2026-0064

↓ BibTeX ↓ RIS ↓ Markdown ↓ JSON Full citation page →·CC BY 4.0·VN-2026-0064

Internet outage in Vietnam

Evidence

What This Means

How We Detected This

Corroborating Evidence (24)

Affected Services (17)

Blocked Domains (22)

What we cannot say

Cite This Incident

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