Website Availability in South Korea

Wondering whether a website is down for everyone or just unreachable from South Korea? The answer usually hides in the physical layer of the internet. South Korea 🇰🇷 connects to the global network through 17 submarine cable systems that come ashore at 10 landing stations, and its national domain zone is .kr. Every request from a user in South Korea to a foreign server, and every request from abroad to a site hosted in South Korea, physically travels over these systems or their terrestrial backhaul.

This page summarizes what our measurement network knows about internet connectivity in South Korea: which cables serve the country, how its leading internet providers are performing, and what can make a website appear offline for users there while it works everywhere else.

Current connectivity status in South Korea

As of our latest hourly measurement cycle, the national internet signal of South Korea is operating normally (BGP visibility and active probing dip: 0% against the 24-hour baseline). National-level signals catch large events; an individual website can still be unreachable for local reasons, which is what the availability checker above is for.

Connectivity for most users in South Korea is provided by a small group of networks:

If a website fails to load only for customers of one of these providers, the problem is almost always local: DNS resolution inside that network, ISP-level filtering, or a routing issue, rather than the website itself being down.

Submarine cables that connect South Korea to the internet

The following systems land in South Korea. Cable length is a rough proxy for how much of the world a system reaches: long trunks connect continents, short ones link neighbors. Our monitors registered no significant latency anomalies on these systems in the last 30 days.

Plus 5 more systems, mostly regional links. Live health data for every cable is available on the linked pages.

How resilient is South Korea to cable failures?

With 17 cable systems across 10 landing stations, South Korea has one of the most redundant internet connections in the world. Traffic can reroute across many independent systems, so a single cable fault rarely affects end users. Repairs at sea typically take one to several weeks, because a specialized cable ship has to locate the fault, lift the cable and splice it on deck.

Why a website may not load in South Korea

When a site works in other countries but fails in South Korea, the usual suspects are, in order of likelihood: a DNS problem inside a local ISP, a content delivery network misrouting users in South Korea to an unhealthy edge node, a routing or peering issue between local networks and the site's host, and finally a submarine cable incident affecting the whole region.

Our DNS measurements have not flagged systematic national filtering in South Korea, although individual ISPs and corporate networks can still block specific resources.

Neighbors on the same cables

These countries share submarine cable systems with South Korea, so a major cable incident can affect them together:

🇯🇵 Japan (13 shared) · 🇸🇬 Singapore (6 shared) · 🇲🇾 Malaysia (5 shared) · 🇵🇭 Philippines (3 shared) · 🇹🇭 Thailand (3 shared) · 🇺🇸 United States (3 shared)

See the full list on the website availability by country hub.

Data: GeoCables submarine cable telemetry, RIPE Atlas measurements, IODA national signals, APNIC user estimates. Numbers refresh automatically; last update July 11, 2026.