Is there an application that will resolve obfuscated hostnames ?

After several months of learning text scripting at Magic Banana's insistence, there's one last
gap in my project: While nMap is excellent for getting WhoIs-like data (CIDR blocks, autonomous
system numbers, and country codes) from IP addresses, there are still some multiply-addressed
hostnames that can only be discovered with online searches like Google. True, nMap can even do
the same sorts of searches for hostnames as for IP addresses, but it doesn't get 'em all.

Google does well because there are many helpful folks who keep track of the many email scams
and malevolences that are frequently used to attack the Internet infrastructure; and the emails
have headers which reveal the originating IP addresses of their senders as well as the hostnames
that go with those IP addresses.

I have been finishing off my spreadsheets by using Google to find the IP addresses that the
scripts cannot find. While entertaining - because of all the multiply-addressed hostnames that
the searches reveal - it's tedious and time-consuming.

Are there such applications that can be used ? My manual searches just put the target hostname
in quotes ... and then I scan the results for the IP address(es) that the reporters associate
with that hostname. Any suspicious combination of IP address and nonspecific hostname I can also
search in Hurricane Electric's "BGP" application, which will return all the hostnames (actually,
pointer (PTR) records) that are used to identify the IP addresses in the associated CIDR block.
I sometimes find that address space populated with many identical PTR's.

Thanks,
George Langford