Is this domain’s certificate valid?
Who issued it, and when it expires.
Try cloudflare.com,
github.com. One domain in, one answer out. No account needed.
More checks:WHOIS LookupDomain ExpiryDNS Health CheckEmail Security CheckDNSSEC CheckDNS PropagationBlacklist CheckASN LookupSubdomain FinderDNS Record LookupTech Stack Lookup
Common questions
Do I need an account to use the SSL Certificate Check?
No. The SSL Certificate Check runs one live reading for one domain you type, with no account and nothing to install.
Is the result live or from a cache?
Live. It is read when you ask, not served from a stored copy, so it reflects the domain right now.
Is the reading signed?
The live lookup is a fresh reading, not a signed record. Each result links to the domain’s signed record, where past observations are dated and carry a published receipt.