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I am trying to find out if a dedicated server at a hosting site I am using has more than one domain pointing to it through DNS. Is there a way to do a reverse DNS lookup with my host's IP address such that I can get a list of all domains resolving to my host's IP? For example, say my host's IP is 1.2.3.4. There can be multiple domains that resolve to the IP. Is there a way to tell if there is more than just my domain resolving to that IP?

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Have a look at this SF question which is pretty much the same as your's. – Iain♦ Sep 10 '10 at 7:24
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You might take a look at - http://www.sitedossier.com/ip/66.135.200.145

Just swap out the IP address with one of your choice... It's not 100% all inclusive, but pretty good in most cases.

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No this is not possible.
You can only find all PTR entries for the IP but if the guy only add one PTR record you will only get one domain.

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You can't do this directly but some sites do keep track of names <-> ip addresses. Domaintools.com is one such site. If applicable their whois lists under Reverse IP the number of hosts they have seen on a particular ip address e.g.

http://whois.domaintools.com/serverfault.com

shows 4 sites associates with the same IP address as serverfault.com

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