Legacy TLS · Poland (domains)

What share of domains in Poland have legacy TLS 1.0/1.1 still enabled?

9.68%

9.68% of domains in Poland (95% CI 6.42–14.34%), measured across 217 domains on 2026-10-01.

modern only: 90.32%TLS 1.0/1.1 enabled: 9.68%
modern only · 90.32%TLS 1.0/1.1 enabled · 9.68%
Trend

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

How this is measured

Tier 2, via the DomainAPI TLS endpoint, which tests each protocol version explicitly. 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

Supporting a deprecated protocol version is invisible from the browser — the site loads over TLS 1.3 and looks modern — while the server remains willing to downgrade for anything that asks.

Limits of this measurement

Must be measured server-side. A modern client cannot detect this, because its own OpenSSL refuses to offer TLS 1.0/1.1.

The same check, other segments

Show the remaining 64 segments

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