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Data

Incident record · Tanzania

Internet connectivity disruption in Tanzania

Type
disruption
Status
active
Severity
critical
Inspect evidence Cite this incident

Source summary

IODA detected significant connectivity drop in Tanzania. 5 critical alerts recorded.

Open incident JSON
Reported anomaly rate
32.2%

Source-defined signal; not a universal test-failure percentage.

Source measurement count
5

The record’s count can represent aggregate inputs or alerts.

Incident confidence
70%

A source score, not certainty of intentional censorship.

Linked evidence has its own count and confidence fields. These quantities are not interchangeable.

Follow the evidence

5 linked records.

Inspect the observation, the upstream claim and why it was linked.

Linked observation dates

5 dated · 0 without a verified timezone
IODA5 linked records
Mar 27, 2026 · 11:00 UTCMar 27, 2026 · 12:05 UTC

Each point is a linked record. Horizontal position shows observation time; stacking separates nearby points. The full records below provide the values. This is not a measured outage-duration chart.

Upstream claims are attributed to their source. Multiple records or source names do not by themselves establish independent corroboration.

IODA5 records · open evidence

outage · critical

ioda:alert:bgp:region:4223:1774613100

IODA detected critical level outage for Pwani

Upstream claim · IODA
Signal value
0.018519
Signal baseline
54
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-04-12 16:58:23.962327 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 25888816,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-27T12:05:00Z",
  "probeNodeId": null,
  "regionCode": "4223",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 3,
  "signalBaseline": 54,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.018518518518518517,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4223:1774613100",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Pwani",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4225:1774609800

IODA detected critical level outage for Zanzibar West

Upstream claim · IODA
Signal value
0.463415
Signal baseline
82
Evidence confidence
75%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-04-12 16:58:23.962327 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.75,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 25888795,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-27T11:10:00Z",
  "probeNodeId": null,
  "regionCode": "4225",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 3,
  "signalBaseline": 82,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.4634146341463415,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4225:1774609800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Zanzibar West",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4220:1774609800

IODA detected critical level outage for Morogoro

Upstream claim · IODA
Signal value
0.533333
Signal baseline
30
Evidence confidence
77%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-04-12 16:58:23.962327 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.77,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 25888799,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-27T11:10:00Z",
  "probeNodeId": null,
  "regionCode": "4220",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 3,
  "signalBaseline": 30,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.5333333333333333,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4220:1774609800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Morogoro",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4219:1774609800

IODA detected critical level outage for Dar-Es-Salaam

Upstream claim · IODA
Signal value
0.324149
Signal baseline
617
Evidence confidence
75%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-04-12 16:58:23.962327 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.75,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 25888806,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-27T11:10:00Z",
  "probeNodeId": null,
  "regionCode": "4219",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 3,
  "signalBaseline": 617,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.3241491085899514,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4219:1774609800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Dar-Es-Salaam",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4232:1774609200

IODA detected critical level outage for Arusha

Upstream claim · IODA
Signal value
0.272727
Signal baseline
88
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-04-12 16:58:23.962327 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 25888792,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-27T11:00:00Z",
  "probeNodeId": null,
  "regionCode": "4232",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 3,
  "signalBaseline": 88,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.2727272727272727,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4232:1774609200",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Arusha",
  "upstreamSeverity": "critical"
}
Source-reported corroboration

The source’s corroboration assessment is separate from incident confidence and evidence-link confidence. Inspect its source list, count and description.

{
  "description": "Single source: ioda",
  "evidenceCount": 5,
  "level": "low",
  "score": 0.6,
  "sourceCount": 1,
  "sources": [
    "ioda"
  ]
}

Declared incident sources: IODA.

This record does not list two distinct sources. Treat it as a single-source or uncorroborated record.

Scope and attribution

What the record names.

Methodology

Affected services

No services named.

Incident mechanism

Infrastructure outage

Individual evidence may carry more specific methods. Those do not automatically describe the entire incident.

Affected domains · 0

Domains named by the source record. Each link opens country-specific OONI measurements; a named domain is not a blanket national-block verdict.

No domains named.

Networks and evidence attribution

ASNs named by this source record: None listed.

This aggregate describes fields literally present in linked evidence. It does not identify who caused an event or prove intent.

{
  "asns_attributed": 0,
  "domains_attributed": 0,
  "methods": [
    {
      "evidence_count": 5,
      "method": "outage"
    }
  ],
  "note": "Aggregated from this incident's linked evidence rows — only domains, ASNs, and blocking methods the evidence literally records are shown, with the per-item evidence count. No per-domain/per-ASN attribution is present in the linked evidence for this incident (e.g. country/ASN-level outage signals).",
  "sources": [
    "ioda"
  ],
  "top_asns": [],
  "top_domains": []
}
What this record cannot establish

Measurements alone do not attribute an event to a government, ISP or another actor, and do not establish intent. An outage or anomalous result can have several explanations.

The country label is an aggregation scope. It is not a census of every network, city or service. Regional or ASN fields belong to their individual source evidence and should not be expanded into a national claim.

The source observation window and evidence timestamps do not prove an exact start and stop of blocking.

Signal definitions, baseline rates and model versions depend on the source. This record does not establish a common baseline or calibrated certainty. Use the source’s specific signal definition and evaluation before interpreting a score.

Inspect measurement coverage

Cite this incident

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Use the permanent published URL.
The original source title is preserved.

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The record over time.

Created
2026-04-12 16:58:24.853742 · timezone unspecified
Last updated
2026-04-12 16:58:24.853742 · timezone unspecified
Revision
1
Revision history and original fields

Revision-history array unavailable.

Canonical ID: TZ-2026-0028. Source ID: TZ-2026-0028. Hash ID: 39d1a511601c.

Additional source duration field: 1.0833 hours. It is retained separately from the minutes field and does not establish a verified event duration.

Complete source JSON
{
  "affectedAsns": [],
  "affectedDomains": [],
  "affectedServices": [],
  "anomalyRate": 0.3224285734630835,
  "attribution": {
    "asns_attributed": 0,
    "domains_attributed": 0,
    "methods": [
      {
        "evidence_count": 5,
        "method": "outage"
      }
    ],
    "note": "Aggregated from this incident's linked evidence rows — only domains, ASNs, and blocking methods the evidence literally records are shown, with the per-item evidence count. No per-domain/per-ASN attribution is present in the linked evidence for this incident (e.g. country/ASN-level outage signals).",
    "sources": [
      "ioda"
    ],
    "top_asns": [],
    "top_domains": []
  },
  "confidence": 0.7,
  "corroboration": {
    "description": "Single source: ioda",
    "evidenceCount": 5,
    "level": "low",
    "score": 0.6,
    "sourceCount": 1,
    "sources": [
      "ioda"
    ]
  },
  "country": "TZ",
  "countryName": "Tanzania",
  "createdAt": "2026-04-12T16:58:24.853742",
  "description": "IODA detected significant connectivity drop in Tanzania. 5 critical alerts recorded.",
  "duration": 64,
  "durationHours": 1.0833,
  "endTime": "2026-03-27T12:05:00Z",
  "evidence": [
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 25888816,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-27T12:05:00Z",
      "probeNodeId": null,
      "regionCode": "4223",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 3,
      "signalBaseline": 54,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.018518518518518517,
      "source": "ioda",
      "sourceRef": "ioda:alert:bgp:region:4223:1774613100",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Pwani",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.75,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 25888795,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-27T11:10:00Z",
      "probeNodeId": null,
      "regionCode": "4225",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 3,
      "signalBaseline": 82,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.4634146341463415,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:4225:1774609800",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Zanzibar West",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.77,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 25888799,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-27T11:10:00Z",
      "probeNodeId": null,
      "regionCode": "4220",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 3,
      "signalBaseline": 30,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.5333333333333333,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:4220:1774609800",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Morogoro",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.75,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 25888806,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-27T11:10:00Z",
      "probeNodeId": null,
      "regionCode": "4219",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 3,
      "signalBaseline": 617,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.3241491085899514,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:4219:1774609800",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Dar-Es-Salaam",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 25888792,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-27T11:00:00Z",
      "probeNodeId": null,
      "regionCode": "4232",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 3,
      "signalBaseline": 88,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.2727272727272727,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:4232:1774609200",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TZ",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Arusha",
      "upstreamSeverity": "critical"
    }
  ],
  "evidenceCount": 5,
  "evidenceSourceBreakdown": {
    "ioda": 5
  },
  "evidenceSpan": {
    "earliest": "2026-03-27T11:00:00Z",
    "latest": "2026-03-27T12:05:00Z"
  },
  "flag": "🇹🇿",
  "generated_at_utc": "2026-09-20T09:05:51.607926Z",
  "hashId": "39d1a511601c",
  "id": "TZ-2026-0028",
  "incidentType": "disruption",
  "measurementCount": 5,
  "mechanism": "Infrastructure outage",
  "readableId": "TZ-2026-0028",
  "reportUrl": "https://api.voidly.ai/data/incidents/39d1a511601c/report?format=markdown",
  "revision": 1,
  "severity": "critical",
  "severityGrade": "B",
  "sources": [
    "ioda"
  ],
  "startTime": "2026-03-27T11:00:00Z",
  "status": "active",
  "title": "Internet connectivity disruption in Tanzania",
  "updatedAt": "2026-04-12T16:58:24.853742"
}
All Tanzania incidents
Sep 19, 2026 · censorshipCensorship detected in TZSep 18, 2026 · disruptionInternet connectivity disruption in TanzaniaSep 18, 2026 · censorshipCensorship detected in TZSep 17, 2026 · censorshipCensorship detected in TZSep 16, 2026 · censorshipCensorship detected in TZSep 15, 2026 · censorshipCensorship detected in TZ
More with the same mechanism · Infrastructure outage
Sep 12, 2026Internet connectivity disruption in TanzaniaSep 10, 2026Internet connectivity disruption in TanzaniaSep 7, 2026Internet connectivity disruption in TanzaniaSep 4, 2026Internet connectivity disruption in TanzaniaSep 3, 2026Internet connectivity disruption in Tanzania

Related records come from up to 100 recent records in the same country. They do not establish a causal connection.

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