Certificate trust · South Korea (domains)
What share of domains in South Korea have a certificate that is self-signed or invalid for its hostname?
35.8% of domains in South Korea (95% CI 28.83–43.44%), measured across 162 domains on 2026-10-01.
Measured every Wednesday since 2026-08-01 — 12 observations to date. Last measured 2026-10-01.
How this is measured
Tier 2; compare issuer/subject and check the SAN list covers the host. Denominator: has_web.
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.
Why it matters
HTTPS is present, the port is open, TLS negotiates — and every visitor gets a browser warning, or would if they checked. Encryption without authentication.
The same check, other segments
- Slovakia (domains)15.86%
- UK dormant companies14.47%
- Japan (domains)14.29%
- Hong Kong (domains)13.15%
- Russia (domains)12.9%
- France medium companies12.88%
- Germany (domains)11.83%
- UK micro companies11.54%
Show the remaining 64 segments
- Taiwan (domains)11.18%
- France small companies11.11%
- the EU (domains)11.05%
- Poland (domains)10.96%
- Estonia (domains)10.95%
- France companies10.88%
- Lithuania (domains)10.78%
- Austria (domains)10.75%
- UK small companies10.45%
- UK companies10.32%
- UK medium & large companies10.24%
- Denmark (domains)10.04%
- Ukraine (domains)9.8%
- France micro companies9.55%
- Vietnam (domains)9.52%
- Thailand (domains)9.43%
- the Netherlands (domains)9.43%
- Italy (domains)9.41%
- Hungary (domains)9.38%
- Czechia (domains)9.16%
- Luxembourg (domains)8.76%
- Norway large companies8.28%
- the UK (domains)8.28%
- Turkey (domains)7.94%
- Ireland (domains)7.72%
- Norway medium companies7.62%
- global domains7.51%
- Slovenia (domains)7.38%
- Iceland (domains)7.37%
- Norway (domains)7%
- France (domains)6.93%
- the US (domains)6.93%
- Brazil (domains)6.83%
- Spain (domains)6.57%
- Norway companies6.52%
- Switzerland (domains)6.47%
- Greece (domains)6.42%
- Finland (domains)6.37%
- Sweden (domains)6.02%
- Belgium (domains)5.69%
- Latvia (domains)5.58%
- Norway micro companies5.46%
- Norway small companies5.41%
- Australia (domains)5.38%
- Argentina (domains)5.34%
- UK newly-formed (no accounts filed) companies5.2%
- Peru (domains)4.65%
- Portugal (domains)4.58%
- Canada (domains)4.57%
- Singapore (domains)4.44%
- Malaysia (domains)3.83%
- Indonesia (domains)3.7%
- New Zealand (domains)3.28%
- the Philippines (domains)3.25%
- the UAE (domains)3.1%
- Croatia (domains)2.84%
- Israel (domains)2.79%
- Bulgaria (domains)2.71%
- South Africa (domains)2.57%
- Mexico (domains)2.3%
- Chile (domains)2.16%
- India (domains)1.74%
- Saudi Arabia (domains)1.62%
- Romania (domains)1.18%