Unverified50% confidenceFactExact time
Certificate Transparency (CT) logs are public SSL/TLS certificate logging systems; researchers can discover newly launched subdomains by querying CT logs, even if those subdomains do not appear in DNS records.
1
Sources
50%
Confidence
Long-term
Relevance
10/20/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedAll publicly trusted CAs must submit certificate information to at least one CT log when issuing a certificate, so when a new website applies for an SSL certificate, its domain information appears in the public log.75% similarUnverifiedThe author built CT Lookup, which outputs certificate transparency data as JSON and includes a watchlist that can catch certificates issued for your domain that you did not apply for.66% similarUnverifiedCertificate Transparency is a public certificate issuance logging system promoted by Google in 2013 to prevent CAs from erroneously or maliciously issuing certificates.65% similarUnverifiedDomain validation (DV) is the most basic step in certificate issuance, through which a CA confirms that the applicant has actual control over the target domain.64% similarUnverifiedSince 2018, Chrome has required all newly issued publicly trusted certificates to include a Signed Certificate Timestamp (SCT) from a CT log; otherwise, the browser will display a warning.63% similar
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