Watching feeds of Certificate Transparency logs, and optionally going beyond those hostnames by using the newly discovered names to find additional ones, is one

Watching feeds of Certificate Transparency logs, and optionally going beyond those hostnames by using the newly discovered names to find additional ones, is one approach. Google hosts a page [0] to search them, but there are other services/APIs that let you consume them in realtime - seeing certificate issuance live. If you wanted to consume them programmatically without a 3rd party service, everything you need is in this repo [1]. 0: https://transparencyreport.google.com/https/certificates https://transparencyreport.google.com/https/certificates 1: https://github.com/google/certificate-transparency-community-site/blob/master/docs/google/known-logs.md https://github.com/google/certificate-transparency-community...