> I'm looking for a way to obtain the DNS servers of a domain 
> without having to do a whois and parsing the whois information.
> 
> I have been able to get the IPs of "www.domain.com" but can't 
> get ns1.hostingprovider.com and ns2.hostingprovider.com from 
> domain.com if those are the NS records...

I don't think you'll be able to do this. You're getting IP addresses for
hostnames from those authoritative name servers, or from cached queries made
to those name servers.

When you type www.domain.com in a browser, your computer has to find out the
IP address for that hostname. So, it asks whatever nameserver your computer
is configured to use, and if that nameserver knows, it'll respond with the
IP address. But of course, your nameserver probably won't know, so it'll
have to ask another nameserver. It won't even know what nameserver to ask -
the authoritative nameserver for domain.com - so it'll ask a root nameserver
for the .com domain for the identity of the authoritative nameservers for
domain.com. It'll then query those nameservers directly.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized
instruction at our training centers in Washington DC, Atlanta,
Chicago, Baltimore, Northern Virginia, or on-site at your location.
Visit http://training.figleaf.com/ for more information!

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