Certificate Transparency Lookup

Searches public Certificate Transparency logs to verify information about SSL/TLS certificates issued for specified domains and subdomains. Users input a domain name or certificate details, and the tool queries multiple global log sources, compiling a record of when and where the certificate was publicly recorded. It displays key metadata associated with the certificate, such as the issuing authority (Certificate Authority), validity dates, and the full list of names covered by the certificate's Subject Alternative Name field. Security professionals, domain owners, and privacy-conscious individuals utilize this resource to audit their online presence for unauthorized certificates. By checking transparency logs, users can proactively detect if a third party has issued a certificate for a subdomain they do not control or if an old, expired certificate remains publicly recorded.