Certificate Transparency for SSL/TLS certificates is a project of certificate authorities that publish each SSL/TLS certificate to a public log. An SSL/TLS certificate usually contains a domain name, subdomain name and email address. The easiest way to find out which certificate a domain belongs to is to use a search engine to search some public CT logs.
Online query:
https://crt.sh/
https://censys.io/
https://developers.facebook.com/tools/ct/
https://google.com/transparencyreport/https/ct/
https:/ /transparencyreport.google.com/https/certificates
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