Active Incident
Confirmed: internet outage in Vietnam
Vietnam · September 2, 2026 · Ongoing
IODA detected significant connectivity drop in Vietnam. 35 critical alerts recorded. CenAlert confirms censorship activity.
Evidence
23%
Anomaly Rate
35
Measurements
75%
Confidence
What This Means
23% of tests showed anomalies, above the typical 1-3% baseline. This suggests potential network interference.
How We Detected This
Data Sourceioda + censoredplanet
ML ModelGradientBoosting v3.3 (LOCO mean F1 0.71, 0.63 on the countries with n≥30)
Confidence Score75% certainty of censorship
Detection TimeSeptember 2, 2026
Corroborating Evidence (60)
Evidence collected from multiple independent sources. Upstream claims shown in quotes are not Voidly assertions.
IODAInternet Outage Detection & Analysis35 records
outage
"IODA detected critical level outage for Hòa Bình"— IODA report
Signal value: 0.27
Sep 2, 2026
View source →outage
"IODA detected critical level outage for Vĩnh Long"— IODA report
Signal value: 0.22
Sep 2, 2026
View source →outage
"IODA detected critical level outage for Lai Chau"— IODA report
Signal value: 0.21
Sep 2, 2026
View source →outage
"IODA detected critical level outage for Yên Bái"— IODA report
Signal value: 0.20
Sep 2, 2026
View source →outage
"IODA detected critical level outage for Nam Định"— IODA report
Signal value: 0.22
Sep 2, 2026
View source →+ 30 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
Sep 2, 2026
View source →dns-blocking
"DNS blocking detected: 5/5 probes anomalous (100.0%) for chat.openai.com"— Censored Planet report
Signal value: 1.00
Sep 2, 2026
View source →dns-blocking
"DNS blocking detected: 3/3 probes anomalous (100.0%) for chatgpt.com"— Censored Planet report
Signal value: 1.00
Sep 2, 2026
View source →dns-blocking
"DNS blocking detected: 3/3 probes anomalous (100.0%) for claude.ai"— Censored Planet report
Signal value: 1.00
Sep 2, 2026
View source →dns-blocking
"DNS blocking detected: 3/3 probes anomalous (100.0%) for facebook.com"— Censored Planet report
Signal value: 1.00
Sep 2, 2026
View source →+ 20 more Censored Planet records
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-2026-0966]. Voidly Global Censorship Index. https://voidly.ai/incident/VN-2026-0966
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