Active Incident
Confirmed: internet outage in Japan
Japan · September 3, 2026 · Ongoing
IODA detected significant connectivity drop in Japan. 48 critical alerts recorded.
Evidence
30%
Anomaly Rate
48
Measurements
75%
Confidence
What This Means
30% of tests showed anomalies, above the typical 1-3% baseline. This suggests potential network interference.
How We Detected This
Data Sourceioda
ML ModelGradientBoosting v3.3 (LOCO mean F1 0.71, 0.63 on the countries with n≥30)
Confidence Score75% certainty of censorship
Detection TimeSeptember 3, 2026
Corroborating Evidence (48)
Evidence collected from multiple independent sources. Upstream claims shown in quotes are not Voidly assertions.
IODAInternet Outage Detection & Analysis48 records
outage
"IODA detected critical level outage for Tokyo"— IODA report
Signal value: 0.20
Sep 3, 2026
View source →outage
"IODA detected critical level outage for Fukushima"— IODA report
Signal value: 0.27
Sep 3, 2026
View source →outage
"IODA detected critical level outage for Gunma"— IODA report
Signal value: 0.24
Sep 3, 2026
View source →outage
"IODA detected critical level outage for Niigata"— IODA report
Signal value: 0.28
Sep 3, 2026
View source →outage
"IODA detected critical level outage for Yamanashi"— IODA report
Signal value: 0.29
Sep 3, 2026
View source →+ 43 more IODA 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.
- Independent corroboration — this rests on a single source; treat it as a single-source signal, not a multi-source confirmation.
Cite This Incident
Voidly Research. (2026). Confirmed: internet outage in Japan [JP-2026-0023]. Voidly Global Censorship Index. https://voidly.ai/incident/JP-2026-0023
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