SSL Certificate Lookup
Look up full SSL certificate details for any domain — issuer, subject, validity, and every name the certificate covers.
What an SSL certificate lookup reveals
A lookup returns the certificate the server presents: who it was issued to (subject), the certificate authority that signed it (issuer), the validity period, the signature algorithm, the negotiated TLS protocol, and the list of Subject Alternative Names it protects.
Subject Alternative Names (SANs) explained
Modern certificates secure multiple hostnames through SANs — for example example.com and www.example.com, or a set of subdomains. The lookup lists every covered name so you can confirm the hostname you care about is actually protected.
Frequently asked questions
What information do I need to do a lookup?
Just the domain name. We retrieve the live certificate the server presents over HTTPS.
Is the lookup result live or cached?
Results are cached briefly for speed; use Re-check on the report page to force a fresh lookup.
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