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How do I find out (1) where a range of IP addresses is from. (2) and a rough guess of which ISP owns it?


How do I find out (1) where a range of IP addresses is from. (2) and a rough guess of which ISP owns it?

Is there a tool or database on the Internet that can help me?
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PennGwyn

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cakester

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Doug,

Thanks. Looks good :)
One think though. You sometimes get companies who register IP address ranges in  other countries, then use their home address as the contact..

So what's the deal with IP ranges? Is it the case that an A, B, C range is aloted to a certain country and cannot be used outside?
 Or if classes can be subnetted and used across boarders, then how do I find out what country an IP address is being used in?

C
Then I think you go with PennGwen's suggestion. "RIPE (Europe), APNIC (Asia-Pacific), or there's now one for Latin America."

this info can easily be determined using a IP scanner and then resolving the DNS for the hosts.
the link below is for a program that does all this for you and has a very nice interface.
simply type in the ip ranges you want to scan and hit start, it will show you the DNS resolved names which almost always include the ISP.

http://www.foundstone.com/index.htm?subnav=resources/navigation.htm&subcontent=/resources/overview.htm%3Fcategory%3DScanner
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Thanks for everyones help