crt.sh has rss feeds for any search result you throw at it, e.g.: https://crt.sh/atom?identity=chatgpt.com https://crt.sh/atom?identity=chatgpt.com most commer

crt.sh has rss feeds for any search result you throw at it, e.g.: https://crt.sh/atom?identity=chatgpt.com https://crt.sh/atom?identity=chatgpt.com most commercial offerings are about monitoring your own domain, e.g. from cloudflare, sslmate, etc.