Confirmed: historical blocking: CN 2023-07-23

Voidly Research

Active Incident

Confirmed: historical blocking: CN 2023-07-23

China · July 23, 2023 · 1 day

Backfilled from OONI historical archive. 1 anomalous day(s), 2 measurements, 68% anomaly rate. Signal types: block, interference. Signal levels: critical.

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Evidence

68%

Anomaly Rate

2

Measurements

86%

Confidence

What This Means

68% of 2 network tests from China failed to reach these services. Global baseline failure rate is typically 1-3%. This 65+ 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 Score86% certainty of censorship

Detection TimeJuly 23, 2023

Full methodology →

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. (2023). Confirmed: historical blocking: CN 2023-07-23 [CN-2023-0536]. Voidly Global Censorship Index. https://voidly.ai/incident/CN-2023-0536

↓ BibTeX ↓ RIS ↓ Markdown ↓ JSON Full citation page →·CC BY 4.0·CN-2023-0536

Confirmed: historical blocking: CN 2023-07-23

Evidence

What This Means

How We Detected This

What we cannot say

Cite This Incident

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