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2.63.a76559e

Certificate Transparency Log Search

Search Certificate Transparency logs for all SSL/TLS certificates issued for a domain. Detect unauthorized certificates and track your issuance history via crt.sh.

Examples:

Enter a domain to search certificate transparency logs

Related Tools

AXFR Zone Test

Test if your nameservers allow DNS zone transfers. A server that responds to AXFR queries exposes your full DNS structure including internal hostnames.

CAA Record

Check which Certificate Authorities are permitted to issue SSL/TLS certificates for a domain.

OCSP Checker

Check a TLS certificate's revocation status through OCSP, the CRL and the stapled response the server sends.

About this tool

Certificate Transparency (RFC 6962) requires all publicly trusted SSL/TLS certificates to be logged in publicly auditable logs. This lets domain owners detect certificates issued without their knowledge - a key defense against misissuance by compromised CAs or fraudulent certificate requests.

Use CT logs to monitor your domain for unauthorized certificates, verify your CAA records are being honored, and audit the history of certificates your domain has used. Data is sourced from crt.sh, which aggregates logs from all major CT log operators. Results show up to 100 certificates, sorted by validity then newest first.