Internet outage history
South Korea
Operational 20/20 hosts up since Oct 16, 2026 10:00 UTC
Every disruption Blackout Map has recorded in South Korea since monitoring began on October 16, 2026, with reported government shutdowns and submarine cable incidents.
Overview
Last 90 days
Worst status per day, last 90 daysDaily reachability
last 30 daysOur probes · hosts reachable
last 72 hoursIODA · routes and active probing, % of normal
last 72 hoursLatency from our server (Germany)
last 72 hoursThe same measurements as the live panel, per 30 minutes. Times in UTC.
Incidents
All incidents
our probes and IODANo disruptions recorded in South Korea since monitoring started on October 16, 2026.
Regional outages · our probes
Outages in one state or province while the rest of South Korea stayed online, measured by our own probes. Hosts are placed by IP geolocation (DB-IP), which is sometimes off.
| Region | Started (UTC) | Duration | Worst level |
|---|---|---|---|
| Gangwon-do | Oct 20, 2026 15:25 | 35 min | Blackout |
Attacks and context
Context only — they don't change the status above.
DDoS attacks aimed at South Korea · 7 days
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
- UDP Flood 36% · SYN Flood 31% · NTP Amplification 15% · Mirai (UDP) Flood 8%
- Duration
- 79% longer than 1 h · 13% under 20 min
- Size
- 94% under 500 Mbit/s · 2% over 10 Gbit/s
- Web attacks from
- Korea Telecom 51% · SK Broadband Co 15% · LG POWERCOMM 9%
Routing incidents · 7 days · Cloudflare Radar
0 possible hijacks of networks in South Korea, 1+ route leaks involving it.
Long-term history
Before our monitoring: IODA archive
9 incidents · 4 blackouts · 2 partial outagesOutages in South Korea 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) | Duration | Worst level | Evidence |
|---|---|---|---|
| Jun 20, 2026 11:40 | 2 hours | Blackout | IODA (Georgia Tech): active probing, lowest 32% of normal |
| May 3, 2026 20:50 | 50 min | Blackout | IODA (Georgia Tech): active probing, lowest 37% of normal |
| Aug 10, 2025 07:30 | 30 min | Degraded | IODA (Georgia Tech): active probing, lowest 83% of normal |
| Mar 29, 2025 10:10 | 3 hours | Blackout | IODA (Georgia Tech): active probing, lowest 32% of normal |
| Mar 25, 2025 20:10 | 5 hours | Partial outage | IODA (Georgia Tech): active probing, lowest 80% of normal |
| Mar 25, 2025 17:30 | 50 min | Degraded | IODA (Georgia Tech): active probing, lowest 92% of normal |
| Jul 6, 2024 11:00 | 30 min | Partial outage | IODA (Georgia Tech): active probing, lowest 76% of normal |
| Nov 19, 2023 12:40 | 50 min | Blackout | IODA (Georgia Tech): active probing, lowest 23% of normal |
| Jul 21, 2023 11:20 | 1 hour | Degraded | IODA (Georgia Tech): active probing, lowest 82% of normal |
Government shutdowns and blocks
since 2019The Internet Society Pulse tracker has no recorded government shutdowns or blocks in South Korea since 2019.
Provided by Internet Society.
Submarine cable incidents
No submarine cable incidents recorded for South Korea.
Cable incidents: GeoCables (CC BY 4.0). Context only — they never change a country's status.