From a domain or IP, how to find out which Hosting Provider they have signed up with?

I did whois on IP and it said it come from net2ez.com but I like to find out which third party Web Hosting (or Dedicated/VPS Hosting) they are with..

closed as not constructive by Ward, mdpc, faker, Tom O'Connor, Scott Pack Dec 26 '12 at 20:31

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There is no way to tell. The only thing you can find out (as you already mentioned) is who the maintainer of the IP block is, by running a whois on the IP. There is no way to tell where it goes from there. There could be a dedicated server behind that IP (client A). They can have hosting packages sold to their clients (Client B). But client B might also be a reseller and have client C who is the actual end-user.

There's no way to trace who all the contractors are, that's an administrative thing and is technically untracable. All you can see it the provider that provides/maintains the IP address.

Although the somewhat larger hosting providers/resellers usually have their own PI space with the original maintainer and thus the whois will show their name.

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