SSL checker methodology
What this tool measures, what it does not, and how a score or grade is produced.
What we measure
The certificate presented on port 443: issuer, subject, SAN list, dates, protocol and whether it appears self-signed.
What we do not measure
Full CA/Browser Forum compliance, EV visual treatment in a given browser, or whether the site's content is trustworthy.
How we calculate this
This tool does not assign a grade. Expiry days are a calendar countdown, not a security score.