Confirmed: internet outage in Vietnam

Voidly Research

Active Incident

Confirmed: internet outage in Vietnam

Vietnam · May 3, 2026 · Ongoing

IODA detected significant connectivity drop in Vietnam. 58 critical alerts recorded. CenAlert confirms censorship activity.

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Evidence

58%

Anomaly Rate

58

Measurements

75%

Confidence

What This Means

58% of 58 network tests from Vietnam failed to reach these services. Global baseline failure rate is typically 1-3%. This 55+ 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 Score75% certainty of censorship

Detection TimeMay 3, 2026

Full methodology →

Corroborating Evidence (83)

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

IODAInternet Outage Detection & Analysis58 records

outage

"IODA detected critical level outage for Kon Tum"— IODA report

Signal value: 0.69

May 3, 2026

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outage

"IODA detected critical level outage for Lào Cai"— IODA report

Signal value: 0.65

May 3, 2026

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outage

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

Signal value: 0.59

May 3, 2026

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outage

"IODA detected critical level outage for Nam Định"— IODA report

Signal value: 0.60

May 3, 2026

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outage

"IODA detected critical level outage for Quảng Ninh"— IODA report

Signal value: 0.60

May 3, 2026

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+ 53 more IODA records

Censored PlanetUniversity of Michigan research25 records

dns-blocking

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

Signal value: 1.00

May 3, 2026

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dns-blocking

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

Signal value: 1.00

May 3, 2026

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dns-blocking

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

Signal value: 1.00

May 3, 2026

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dns-blocking

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

Signal value: 1.00

May 3, 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

May 3, 2026

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+ 20 more Censored Planet records

Affected Services (20)

BBCChatGPTClaudeFacebookGeminiInstagramLanternMediumNew York TimesProton VPNProtonVPNPsiphonSignalTelegramThe GuardianTikTokTwitter/XWhatsAppXYouTube

Blocked Domains (25)

bbc.com chat.openai.com chatgpt.com claude.ai facebook.com gemini.google.com getlantern.org google.com huggingface.co instagram.com medium.com nytimes.com openai.com protonvpn.com psiphon.ca reddit.com signal.org substack.com telegram.org theguardian.comand 5 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). Confirmed: internet outage in Vietnam [VN-2026-0081]. Voidly Global Censorship Index. https://voidly.ai/incident/VN-2026-0081

↓ BibTeX ↓ RIS ↓ Markdown ↓ JSON Full citation page →·CC BY 4.0·VN-2026-0081

Confirmed: internet outage in Vietnam

Evidence

What This Means

How We Detected This

Corroborating Evidence (83)

Affected Services (20)

Blocked Domains (25)

What we cannot say

Cite This Incident

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