Ask HN: How did the internet discover my subdomain?

Post by vbhakta » Thu, Mar 20, 2025, 9:36 PM UTC

Nickolya wrote: post #319

yatralalala wrote: post #139

Hi, our company does this basically "as-a-service". The options how to find it are basically limitless. Best source is probably Certificate Transparency project as others suggested. But it does not end there, some other things that we do are things like internet crawl, domain bruteforcing on wildcard dns, dangling vhosts identification, default certs on servers (connect to IP on 443 and get default cert) and many oth…

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