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Incident record · Japan

Internet connectivity disruption in Japan

Type
disruption
Status
active
Severity
critical
Inspect evidence Cite this incident

Source summary

IODA detected significant connectivity drop in Japan. 2 critical alerts recorded.

Open incident JSON
Reported anomaly rate
47.3%

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

Source measurement count
2

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

Incident confidence
67%

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

2 linked records.

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

Linked observation dates

2 dated · 0 without a verified timezone
IODA2 linked records
Mar 22, 2026 · 00:26 UTCMar 22, 2026 · 00:45 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.

IODA2 records · open evidence

outage · critical

ioda:alert:bgp:region:2045:1774140300

IODA detected critical level outage for Hokkaido

Upstream claim · IODA
Signal value
0.011615
Signal baseline
22,041
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": "Asia",
  "countryCode": "JP",
  "domain": null,
  "domainCategory": null,
  "id": 25888079,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-22T00:45:00Z",
  "probeNodeId": null,
  "regionCode": "2045",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 4,
  "signalBaseline": 22041,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.011614718025497935,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:2045:1774140300",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/JP",
  "unSubregion": "Eastern Asia",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Hokkaido",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:merit-nt:region:2058:1774139160

IODA detected critical level outage for Tokyo

Upstream claim · IODA
Signal value
0.935201
Signal baseline
571
Evidence confidence
85%
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": 0.85,
  "continent": "Asia",
  "countryCode": "JP",
  "domain": null,
  "domainCategory": null,
  "id": 25888022,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-03-22T00:26:00Z",
  "probeNodeId": null,
  "regionCode": "2058",
  "retrievedAt": "2026-04-12T16:58:23.962327",
  "riskTier": 4,
  "signalBaseline": 571,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.9352014010507881,
  "source": "ioda",
  "sourceRef": "ioda:alert:merit-nt:region:2058:1774139160",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/JP",
  "unSubregion": "Eastern Asia",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Tokyo",
  "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": 2,
  "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": 2,
      "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: JP-2026-0006. Source ID: JP-2026-0006. Hash ID: ddcd76ab9fef.

Additional source duration field: 0.3167 hours. It is retained separately from the minutes field and does not establish a verified event duration.

Complete source JSON
{
  "affectedAsns": [],
  "affectedDomains": [],
  "affectedServices": [],
  "anomalyRate": 0.473408059538143,
  "attribution": {
    "asns_attributed": 0,
    "domains_attributed": 0,
    "methods": [
      {
        "evidence_count": 2,
        "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": 0.67,
  "corroboration": {
    "description": "Single source: ioda",
    "evidenceCount": 2,
    "level": "low",
    "score": 0.6,
    "sourceCount": 1,
    "sources": [
      "ioda"
    ]
  },
  "country": "JP",
  "countryName": "Japan",
  "createdAt": "2026-04-12T16:58:24.853742",
  "description": "IODA detected significant connectivity drop in Japan. 2 critical alerts recorded.",
  "duration": 19,
  "durationHours": 0.3167,
  "endTime": "2026-03-22T00:45:00Z",
  "evidence": [
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": "Asia",
      "countryCode": "JP",
      "domain": null,
      "domainCategory": null,
      "id": 25888079,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-22T00:45:00Z",
      "probeNodeId": null,
      "regionCode": "2045",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 4,
      "signalBaseline": 22041,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.011614718025497935,
      "source": "ioda",
      "sourceRef": "ioda:alert:bgp:region:2045:1774140300",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/JP",
      "unSubregion": "Eastern Asia",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Hokkaido",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.85,
      "continent": "Asia",
      "countryCode": "JP",
      "domain": null,
      "domainCategory": null,
      "id": 25888022,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-03-22T00:26:00Z",
      "probeNodeId": null,
      "regionCode": "2058",
      "retrievedAt": "2026-04-12T16:58:23.962327",
      "riskTier": 4,
      "signalBaseline": 571,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.9352014010507881,
      "source": "ioda",
      "sourceRef": "ioda:alert:merit-nt:region:2058:1774139160",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/JP",
      "unSubregion": "Eastern Asia",
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Tokyo",
      "upstreamSeverity": "critical"
    }
  ],
  "evidenceCount": 2,
  "evidenceSourceBreakdown": {
    "ioda": 2
  },
  "evidenceSpan": {
    "earliest": "2026-03-22T00:26:00Z",
    "latest": "2026-03-22T00:45:00Z"
  },
  "flag": "🇯🇵",
  "generated_at_utc": "2026-09-20T16:18:07.385253Z",
  "hashId": "ddcd76ab9fef",
  "id": "JP-2026-0006",
  "incidentType": "disruption",
  "measurementCount": 2,
  "mechanism": "Infrastructure outage",
  "readableId": "JP-2026-0006",
  "reportUrl": "https://api.voidly.ai/data/incidents/ddcd76ab9fef/report?format=markdown",
  "revision": 1,
  "severity": "critical",
  "severityGrade": "B",
  "sources": [
    "ioda"
  ],
  "startTime": "2026-03-22T00:26:00Z",
  "status": "active",
  "title": "Internet connectivity disruption in Japan",
  "updatedAt": "2026-04-12T16:58:24.853742"
}
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