Legacy TLS · Switzerland (domains)

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

5.05%

5.05% of domains in Switzerland (95% CI 3.03–8.3%), measured across 277 domains on 2026-08-13.

modern_only: 94.95%legacy_enabled: 5.05%
modern_only · 94.95%legacy_enabled · 5.05%
Trend

Measured every Thursday since 2026-08-01 — 2 observations to date. Last measured 2026-08-13.

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 65 segments

Share or cite this figure

Reuse is free under CC BY 4.0 — attribution to Quiet Failures is all we ask.

Post on X

Embed this stat

Free to reuse under CC BY 4.0 — the card links back and updates as the data does.

<iframe src="https://quietfailures.com/embed/tls-legacy/ch" width="380" height="210" style="border:0;max-width:100%" loading="lazy" title="What share of domains in Switzerland have legacy TLS 1.0/1.1 still enabled?"></iframe>