Certificate lifetime · UK micro companies

What share of UK micro companies have certificates issued for longer than the 47-day maximum?

27.17%

27.17% of UK micro companies (95% CI 21.26–34.02%), measured across 184 companies on 2026-08-15.

short_lived_ready: 72.83%long_lived: 27.17%
short_lived_ready · 72.83%long_lived · 27.17%
Trend

Measured every Saturday since 2026-08-01 — 3 observations to date. Last measured 2026-08-15.

How this is measured

Tier 1. Validity window of the serving certificate. 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: national company registries (Companies House, Brreg, SIRENE), sampled by size band and resolved to email-active domains. Parked domains excluded. Snapshot: uk-companies-house-per600-seed20260728.

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

Why it matters

The CA/Browser Forum is phasing certificate lifetimes down to 47 days. Any domain still on long-lived certificates has a manual renewal process that is about to break several times a year — a deadline-driven quiet failure that has not fired yet.

The same check, other segments

Show the remaining 64 segments

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