BLACKOUT MAP

Internet outage history

Japan

Operational 20/20 hosts up since Oct 16, 2026 10:00 UTC

Every disruption Blackout Map has recorded in Japan since monitoring began on October 16, 2026, with reported government shutdowns and submarine cable incidents.

Live status of Japan RSS feed

Kanagawa — Operational · 2/2 hosts upTokyo — Operational · 14/14 hosts up
Regions right now Operational Degraded Partial outage Blackout Each dot is a state or province we measure separately, coloured by its status now; bigger dots have more hosts. The country is shaded in its overall status.
0incidents recorded
0total disruption
—longest incident
16outages measured since 2022
0reported shutdowns since 2019

Overview

Last 90 days

Worst status per day, last 90 days
Aug 1, 2026 Operational Degraded Partial outage Blackout Not monitored yet Today

Daily reachability

last 30 days
Oct 16Oct 230%50%100%
Hosts uplowest hour

Our probes · hosts reachable

last 72 hours
Oct 27Oct 28Oct 290%50%100%

IODA · routes and active probing, % of normal

last 72 hours
Oct 27Oct 28Oct 290%50%100%
BGP routesActive probingIODA (Georgia Tech)

Latency from our server (Germany)

last 72 hours
Oct 27Oct 28Oct 290 ms200 ms400 ms
Latency25–75%

The same measurements as the live panel, per 30 minutes. Times in UTC.

Incidents

All incidents

our probes and IODA

No disruptions recorded in Japan since monitoring started on October 16, 2026.

Attacks and context

Context only — they don't change the status above.

DDoS attacks aimed at Japan · 7 days

Oct 23Oct 24Oct 25Oct 26Oct 27Oct 280%50%100%
Network DDoSWeb attacksCloudflare Radar

Per hour; each line is relative to its own busiest hour of the week (100%). Context only — attacks never change a country's status.

Types
GRE Flood 40% · UDP Flood 16% · SYN Flood 12% · Mirai (TCP) Flood 11%
Duration
78% longer than 1 h · 14% under 20 min
Size
77% under 500 Mbit/s · 2% over 10 Gbit/s
Web attacks from
Google 24% · Amazon.com 13% · KDDI 4%

Routing incidents · 7 days · Cloudflare Radar

6 possible hijacks of networks in Japan, 3+ route leaks involving it.

  • Oct 27 12:18 AS10010 (JP) · 1 address blocks · confidence 8/10
  • Oct 27 05:27 AS396356 (US) · 4 address blocks · confidence 10/10
  • Oct 26 09:03 AS10010 (JP) · 1 address blocks · confidence 8/10
  • Oct 25 14:09 AS10010 (JP) · 1 address blocks · confidence 8/10
  • Oct 24 11:09 AS10010 (JP) · 1 address blocks · confidence 8/10

Long-term history

Before our monitoring: IODA archive

16 incidents · 6 blackouts · 7 partial outages

Outages in Japan detected by IODA (Georgia Tech) between January 2022 and the start of our own monitoring: drops in the country's internet routes (BGP) or in its reachability from IODA's active probing, compared with the day before. Each is checked against IODA's signal; small dips are left out.

Started (UTC)DurationWorst levelEvidence
Oct 15, 2026 22:2030 min BlackoutIODA (Georgia Tech): active probing, lowest 7% of normal
Sep 3, 2026 08:001 hour DegradedIODA (Georgia Tech): active probing, lowest 84% of normal
Sep 3, 2026 01:105 hours Partial outageIODA (Georgia Tech): active probing, lowest 65% of normal
Sep 2, 2026 14:208 hours Partial outageIODA (Georgia Tech): active probing, lowest 67% of normal
Aug 23, 2026 01:2030 min Partial outageIODA (Georgia Tech): active probing, lowest 77% of normal
Jun 20, 2026 11:402 hours BlackoutIODA (Georgia Tech): active probing, lowest 27% of normal
May 3, 2026 20:5050 min BlackoutIODA (Georgia Tech): active probing, lowest 35% of normal
Aug 10, 2025 07:3030 min DegradedIODA (Georgia Tech): active probing, lowest 84% of normal
Jul 24, 2025 08:5020 min BlackoutIODA (Georgia Tech): active probing, lowest 10% of normal
Apr 30, 2025 16:3050 min Partial outageIODA (Georgia Tech): active probing, lowest 69% of normal
Mar 29, 2025 10:103 hours BlackoutIODA (Georgia Tech): active probing, lowest 30% of normal
Mar 25, 2025 20:104 hours Partial outageIODA (Georgia Tech): active probing, lowest 80% of normal
Show all 16
Started (UTC)DurationWorst levelEvidence
Mar 25, 2025 17:3050 min DegradedIODA (Georgia Tech): active probing, lowest 91% of normal
Jul 6, 2024 11:0030 min Partial outageIODA (Georgia Tech): active probing, lowest 70% of normal
Nov 19, 2023 12:402 hours BlackoutIODA (Georgia Tech): active probing, lowest 20% of normal
Jul 21, 2023 11:202 hours Partial outageIODA (Georgia Tech): active probing, lowest 77% of normal

Government shutdowns and blocks

since 2019

The Internet Society Pulse tracker has no recorded government shutdowns or blocks in Japan since 2019.

Provided by Internet Society.

Submarine cable incidents

Cable incidents: GeoCables (CC BY 4.0). Context only — they never change a country's status.