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      crt.sh

      A popular CT search tool is crt.sh. Subdomains can be detected using Certificate Transparency (CT). SSL/TLS certificates are issued to domain holders by Certificate Authorities (CAs), typically to encrypt communication between browsers and sites. CT increases accountability by requiring CAs to submit certificates to public logs, including any subdomains covered by certificates. Bad actors often obtain certificates to add credibility to sites, and CT logs can be searched for brand-abusive subdomains, but only those for which bad actors have obtained certificates.

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