Internet conditions in Seoul, South Korea
Where this is
The district the measurement describes.
District outline, KASPR boundary layer
The week, hour by hour
Chance of a rough hour, local time. Darker is rougher.
What makes the score
Five parts, each a percentile among scored districts worldwide (100 = best). The second mark is the same part ranked within South Korea.
Two years of months
Monthly mean latency and jitter. The connectivity index compares responding addresses with the district’s own norm.
Disruptions
Falls in responding addresses against the district’s own baseline. The record says when, where and how deep, not why.
Worst hours of a typical week: Sun 22:00, Sun 23:00, Tue 22:00. Chance of a rough hour at the peak: 69%.
Other cities
Grades within each country. Each links to its own page.
What to do with this
Three ways in, one per product.
Check your own locations
Paste your sites or offices and get a grade and a report for each. The first look is free.
Open the location check →When to connect from Seoul
Pick the people on a call or the audience for a post and see the steadier hours, on the web or in Slack.
Open KASPR Sense →Monitor Seoul
Alerts the moment the district breaks, the full history, and the data behind this page in the dashboard.
Explore the dashboard →Questions people ask
- Is the internet in Seoul good?
- By world standards Seoul sits in the 13th percentile of 15,460 scored districts, with 271 ms typical latency and 82 ms jitter. Within South Korea it ranks 197th of 227, in the bottom fifth.
- When is the internet in Seoul worst?
- The roughest slot of a typical week is Sun 22:00, when the chance of a rough hour peaks at 69%. The steadiest is Thu 10:00 at 34%. Between them, the hour of the week barely changes the odds here.
- Were there internet outages in Seoul recently?
- One episode in the last twelve months, 8 days in all. The latest ran from 9 Jul 2026 to 16 Jul 2026, with responding addresses 50% below the district’s baseline.
- How is this measured?
- KASPR sends round-trip requests to geolocated IPv4 addresses from the outside, every hour since February 2019, and aggregates the answers by district. No apps, no speed tests, the same method everywhere. The figures describe the district a city centre falls in, at one data vintage.
Source: KASPR Datahaus (pulse.kasprdata.com) · Data to 2026-07-16 · the measurement records timing and depth, not cause · How KASPR measures