SSL Lookup
Get all possible details about an SSL certificate.
Learn more about the Free online SSL lookup & Certificate Checker
The Big Free Tools SSL Lookup tool is a fast and easy to use online diagnostic tool for evaluating the SSL/TLS certificate installed on your web server. No matter if you just installed a new Let's Encrypt SSL certificate in Cyber Panel/cPanel, activated Cloudflare Universal SSL, or installed your first paid-ofseller Wildcard SSL on Nginx or Lite Speed – our tool immediately scans port 443 to make sure your HTTPS deployment is working, trusted, and chained.
What Does Our SSL Certificate Lookup Inspect?
Displays the date issued, expiration timestamp, and days left on a certificate before it expires so you can avoid the occasional browser security popup.
CN shows what the certificate was issued to, while the issuer informs about the Certificate Authority (Google Trust Services, Digi Cert, Let's Encrypt, ZeroSSL, Sectigo) that issued it.
SANs: Include all other domains, subdomains, and wildcards (*.example.com) covered by this multi-domain certificate.
Certificate Chain of Trust: Checks the server certificate, the intermediate CA certificates and the root authority to catch the "Incomplete Certificate Chain" error that typically breaks HTTPS on a mobile browser or strict API client.
Cryptographic Specifications: Present the signature algorithm, public key type, key serial number and SHA-256 fingerprint.
How to Verify the SSL Certificate of a Domain
Enter the Hostname Type any domain or subdomain (eg. Bigfreetools.com) into the lookup box above-no need to type https://.
Perform the SSL Test Check SSL to start a real, live TLS handshake with the recipient server.
Review Diagnostic Status: Ensure green status validity badge, days left for the certificate to expire, all intermediate certificates are installed correctly.
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