Internet outage in Tanzania

Voidly Research

Active Incident

Internet outage in Tanzania

Tanzania · April 21, 2026 · Ongoing

IODA detected significant connectivity drop in Tanzania. 1 critical alerts recorded. CenAlert confirms censorship activity.

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Evidence

2%

Anomaly Rate

1

Measurements

65%

Confidence

What This Means

2% 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 Score65% certainty of censorship

Detection TimeApril 21, 2026

Full methodology →

Corroborating Evidence (2)

Evidence collected from multiple independent sources. Upstream claims shown in quotes are not Voidly assertions.

IODAInternet Outage Detection & Analysis1 record

outage

"IODA detected critical level outage for Morogoro"— IODA report

Signal value: 0.02

Apr 21, 2026

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Censored PlanetUniversity of Michigan research1 record

http-blocking-timeout

"HTTPS blocking (timeout): 8/11 probes blocked (72.7%) for twitter.com"— Censored Planet report

Signal value: 0.73

Apr 21, 2026

View source →

Affected Services (2)

Twitter/XX

Blocked Domains (1)

twitter.com

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.
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). Internet outage in Tanzania [TZ-2026-0039]. Voidly Global Censorship Index. https://voidly.ai/incident/TZ-2026-0039

↓ BibTeX ↓ RIS ↓ Markdown ↓ JSON Full citation page →·CC BY 4.0·TZ-2026-0039

Internet outage in Tanzania

Evidence

What This Means

How We Detected This

Corroborating Evidence (2)

Affected Services (2)

Blocked Domains (1)

What we cannot say

Cite This Incident

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