A search engine searching by domain?

Question

Search engines

Hello. I remember there was a search engine that searched for sites by domain and found their real IPs. He scanned the entire web and looked at the responses of the servers, compared the certificates and so on, later issued a response.
PS: services giving A dns record will not work here. The site is hidden behind a stormwall.
Do not tell me what kind of search engine was so wonderful, if anyone remembers?

Answer 1

Found, although before that an hour of searching did not give results: https://censys.io/