Defaults.Exposed › September 2026 census › v10 registry › TLS version
TLS version
Methodology v10 · canonical ID tls-version · TLS & Certificates · scored · census as of September 5, 2026
Modern TLS (1.2/1.3); old versions are broken and fail security reviews.
Definition
| Canonical ID | tls-version |
|---|---|
| Category | TLS & Certificates |
| Grade impact | Scored, counts toward the grade |
| Pass | The server negotiates TLS 1.2 or TLS 1.3. |
| Fail | Only legacy protocol versions (TLS 1.0/1.1 or older) are negotiated. |
| Example (passing) | Negotiated protocol: TLS 1.3 |
No-data rule: when this check couldn't be determined for a domain (timeout, SERVFAIL, redacted source) it returns N/A and is excluded from that domain's scoring denominator: "couldn't determine" is never counted as a failure. "Determined absent" is a real fail.
Prevalence across the census
100.0% of HTTPS-serving domains negotiate TLS 1.2 or 1.3 (212,154,494 of 212,154,494, as of September 5, 2026).
Negotiated-version distribution: the remainder is unidentified negotiations; legacy 1.0/1.1 shares are not enumerable in this rollup.
Census denominator: 316,600,902 graded domains; this check is measured only against HTTPS-serving domains (212,154,494). Aggregates only: never an individual domain's result.
Fix it
Plain-English impact, cost of ignoring it, and step-by-step remediation: defaults.exposed/fix/tls
Cite this check
Defaults.Exposed, "TLS version (tls-version)", Grading Methodology v10 (census as of September 5, 2026). https://defaults.exposed/v10/methodology/tls-version
Permalink: https://defaults.exposed/v10/methodology/tls-version ·
All 34 checks: v10 registry ·
Machine-readable: /v10/methodology/checks.json ·
Licence: open data