Active Incident
Confirmed: historical blocking: CN 2022-08-13 to 2022-08-17
China · August 13, 2022 · 5 days
Backfilled from OONI historical archive. 5 anomalous day(s), 12 measurements, 90% anomaly rate. Signal types: block, interference. Signal levels: critical.
Evidence
90%
Anomaly Rate
12
Measurements
95%
Confidence
What This Means
90% of 12 network tests from China failed to reach these services. Global baseline failure rate is typically 1-3%. This 87+ percentage point difference strongly indicates intentional blocking.
How We Detected This
Data Sourceooni-historical-backfill
ML ModelGradientBoosting v3.3 (LOCO median F1 0.87, honest across 127 countries)
Confidence Score95% certainty of censorship
Detection TimeAugust 13, 2022
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.
- 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. (2022). Confirmed: historical blocking: CN 2022-08-13 to 2022-08-17 [CN-2022-0342]. Voidly Global Censorship Index. https://voidly.ai/incident/CN-2022-0342
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