Internet status in Japan Operational
Country-level signal dip: 0% · 2026-06-07 23:08:27 UTC
Leading providers
| Provider | ASN | Population share | Status | Signal dip |
|---|---|---|---|---|
| KDDI CORPORATION | AS2516 | 18.78% | Operational · country signal | — |
| SoftBank Corp. | AS17676 | 17.15% | Operational · country signal | — |
| NTT DOCOMO BUSINESS,Inc. | AS4713 | 10.76% | Operational · country signal | — |
| docomo - NTT DOCOMO, INC. | AS9605 | 6.20% | Operational · country signal | — |
| OPTAGE Inc. | AS17511 | 4.41% | Operational · country signal | — |
Per-ISP signals are measured when the country shows anomalies (and continuously for pilot countries); «No data» means no anomaly drill has been needed recently.
ℹ️ How to read this page
Operational — signal at normal levels for this country / provider
Degraded — signal dip ≥20% below its 24h baseline — partial outage or major disturbance
Major outage — dip ≥50% — large-scale loss of connectivity
“Signal dip” compares the current BGP-visibility and active-probing levels against the median of the previous 24 hours, corrected for global measurement artifacts (a worldwide simultaneous drop is ignored).
Data refreshes hourly. Per-ISP rows are measured in depth when the country shows an anomaly (pilot countries — continuously). The probable cause is a heuristic: an active fault on a submarine cable feeding the country ranks first, then routing signals, then power/access patterns.
Degraded — signal dip ≥20% below its 24h baseline — partial outage or major disturbance
Major outage — dip ≥50% — large-scale loss of connectivity
“Signal dip” compares the current BGP-visibility and active-probing levels against the median of the previous 24 hours, corrected for global measurement artifacts (a worldwide simultaneous drop is ignored).
Data refreshes hourly. Per-ISP rows are measured in depth when the country shows an anomaly (pilot countries — continuously). The probable cause is a heuristic: an active fault on a submarine cable feeding the country ranks first, then routing signals, then power/access patterns.
Submarine cables feeding Japan
If a national outage coincides with a fault on one of these systems, the cable is a likely cause — check its live page:
5 Villages 6 Islands
APCN-2
Apricot
Asia Direct Cable (ADC)
Asia Pacific Gateway (APG)
Asia Submarine-cable Express (ASE)/Cahaya Malaysia
Asia United Gateway East (AUG East)
Australia-Japan Cable (AJC)
Awashima-Murakami
Candle
Daito Loop
E2A
EAC-C2C
FASTER
Sources: APNIC population-per-AS estimates · IODA (Georgia Tech) BGP & active-probing signals · GeoCables submarine-cable telemetry. Status is heuristic, not an official provider statement.