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TLS version
Methodology v7 · canonical ID tls-version · TLS & Certificates · scored · census as of July 28, 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 (210,439,319 of 210,439,319, as of July 28, 2026).
Negotiated-version distribution: the remainder is unidentified negotiations; legacy 1.0/1.1 shares are not enumerable in this rollup.
Census denominator: 275,666,275 graded domains; this check is measured against the HTTPS-serving subset (210,439,319). Aggregates only — never an individual domain's result.
Fix it
Plain-English impact, cost of ignoring it, and step-by-step remediation: defaults.exposed/en/fix/tls
Cite this check
Defaults.Exposed, "TLS version (tls-version)", Grading Methodology v7 (census as of July 28, 2026). https://defaults.exposed/methodology/v7/tls-version
Permalink: https://defaults.exposed/methodology/v7/tls-version ·
All 34 checks: v7 registry ·
Machine-readable: checks.json ·
Licence: open data