Active Incident
Confirmed: internet outage in Iran
Iran · April 19, 2026 · 21 hours
IODA detected significant connectivity drop in Iran. 5 critical alerts recorded. CenAlert confirms censorship activity.
Evidence
28%
Anomaly Rate
5
Measurements
70%
Confidence
What This Means
28% 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 median F1 0.87, honest across 127 countries)
Confidence Score70% certainty of censorship
Detection TimeApril 19, 2026
Corroborating Evidence (14)
Evidence collected from multiple independent sources. Upstream claims shown in quotes are not Voidly assertions.
IODAInternet Outage Detection & Analysis9 records
outage
"IODA detected critical level outage for Alborz"— IODA report
Signal value: 0.24
Apr 19, 2026
View source →outage
"IODA detected critical level outage for Alborz"— IODA report
Signal value: 0.28
Apr 19, 2026
View source →outage
"IODA detected critical level outage for Alborz"— IODA report
Signal value: 0.28
Apr 19, 2026
View source →outage
"IODA detected critical level outage for Alborz"— IODA report
Signal value: 0.24
Apr 19, 2026
View source →outage
"IODA detected critical level outage for Alborz"— IODA report
Signal value: 0.28
Apr 19, 2026
View source →+ 4 more IODA records
Censored PlanetUniversity of Michigan research5 records
dns-blocking
"DNS blocking detected: 2/2 probes anomalous (100.0%) for medium.com"— Censored Planet report
Signal value: 1.00
Apr 19, 2026
View source →dns-blocking
"DNS blocking detected: 2/2 probes anomalous (100.0%) for nytimes.com"— Censored Planet report
Signal value: 1.00
Apr 19, 2026
View source →dns-blocking
"DNS blocking detected: 3/3 probes anomalous (100.0%) for substack.com"— Censored Planet report
Signal value: 1.00
Apr 19, 2026
View source →dns-blocking
"DNS blocking detected: 3/3 probes anomalous (100.0%) for theguardian.com"— Censored Planet report
Signal value: 1.00
Apr 19, 2026
View source →dns-blocking
"DNS blocking detected: 5/5 probes anomalous (100.0%) for tiktok.com"— Censored Planet report
Signal value: 1.00
Apr 19, 2026
View source →Affected Services (4)
MediumNew York TimesThe GuardianTikTok
Blocked Domains (5)
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.
- 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 Iran [IR-2026-0162]. Voidly Global Censorship Index. https://voidly.ai/incident/IR-2026-0162