You can do a whois using the ARIN whois server:

whois ip.address at whois.arin.net

you can also try a traceroute:
traceroute ip.address

and look at the hops immediately before the IP, that would be the internet
provider(s).

Adam Maloney
Systems Administrator
Sihope Communications

On Wed, 4 Oct 2000, Eric Hillman wrote:

> I was sure this subject had come up before, but I can't find any reference to
> it -- does anybody have any tips on tracking down an IP address on the Internet
> that has no reverse-lookup  entry and blocks traceroute?  I'm getting an
> alarming number of internal attempts to access an outside website without
> permission, and I have no idea whether it's some evil spam or just Internet
> Explorer Update doing its thing...
> 
> 
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