Subdomain sprawl · South Korea (domains)

What share of domains in South Korea have ten or more discoverable subdomains?

47.28%

47.28% of domains in South Korea (95% CI 40.2–54.48%), measured across 184 domains on 2026-10-01.

0–2 subdomains: 33.7%3–9: 19.02%10+ (sprawl): 47.28%
0–2 subdomains · 33.7%3–9 · 19.02%10+ (sprawl) · 47.28%
Trend

Measured every Saturday since 2026-08-01 — 11 observations to date. Last measured 2026-10-01.

How this is measured

The same cached call. Bucketed: minimal 0–2, moderate 3–9, sprawling 10+. Denominator: any, capped subset.

Passive measurement: a single DNS lookup, TLS handshake, or homepage GET per domain. Aggregate-only; no individual company is named. 95% Wilson confidence intervals. Population: domains sampled from the Common Crawl web graph, filtered to those that do email. Parked domains excluded. Snapshot: common-crawl-domain-stratified-c400-g2500-seed20260729.

Licensed CC BY 4.0 — reuse with attribution to Quiet Failures. Download: JSON · CSV.

Check a specific domain against this control with the free Subdomain takeover scanner.

Why it matters

Context for takeover risk. Sprawl is not itself a vulnerability, but every forgotten name is a candidate, and most organisations do not know how many they have.

The same check, other segments

Show the remaining 65 segments

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