RSnake of ha.ckers.org documents in this post how to conveniently obtain all the subdomains of a domain using a search engine.  This can help you isolate some spammers.  He later says " … wouldn’t it be nice if we could somehow get access to all the IP address to hostname maps?"  I agree, and here is a partial solution to that request leveraging a search engine — this time MSN Search.  Use the "IP" command to find all hosts located on a certain IP address like follows:

IP:xxx.xxx.xxx.1

You can join them to locate all hosts located on a range of IP addresses as well:

IP:xxx.xxx.xxx.1 IP:xxx.xxx.xxx.2 … IP:xxx.xxx.xxx.9 IP:xxx.xxx.xxx.10.

Here is an example query to see the hosts located on this site's IP.  Since I have a dedicated IP address, it only lists this site.

I could write a little utility that scans a range using their MSN Search RSS Feed if anyone thinks it would be useful.  Of course any spammer putting stuff in one range like this has probably already been banned, according to Matt Cutts.

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