on an episode of hak5 live, they talked about a certain website that had a subdomain scanner that will basically work like if you type in for example forums.com, it will list forums1.com stuff.forums.com and so on (i think chris gerling was the one who showed the website)
one of my friends was looking for a tool like that and i remember it being on a episode of hak5 live but cant seem to find all of the live episodes
need help finding website (subdomains)
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If name servers for your domain allow zone transfers you can use this website to find all subdomains Online full DNS look up. Find all subdomains.