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Certificate Transparency Search

Search CT logs for all certificates issued for a domain and its subdomains.

Certificate Transparency (CT) is a public, append-only log of all SSL/TLS certificates issued by publicly trusted Certificate Authorities. Search crt.sh to discover all subdomains and certificates associated with a domain. Useful for security audits, attack surface discovery and identifying forgotten services.

Queries Certificate Transparency logs via crt.sh to find all certificates issued for this domain and its subdomains.

Privacy: The domain name you enter is queried against the public crt.sh database. No personal data is stored.

Related tools

SSL/TLS Certificate CheckInspect the TLS certificate of a public host.SSL/TLS Deep InspectorFull certificate chain, trust and protocol analysis for any public host.DNS LookupQuery any DNS record type (A, AAAA, MX, TXT, NS, CNAME, SOA and more).

Frequently asked questions

What is Certificate Transparency?

CT is a system that logs every SSL/TLS certificate issued by public CAs, making it possible to discover all certificates (and thus subdomains) for any domain.

Can I find subdomains this way?

Yes. CT logs record every certificate, which includes all domain names (SANs) on the certificate. This often reveals subdomains that are not otherwise publicly listed.