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ISP users and their IP address

Posted on 2002-06-28
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Last Modified: 2013-11-30
Hello,
is it possible to find the range of IP addresses an ISP use for its users.I mean, using WhoIs you can find the addresses of the ISP's servers, but how about users?
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Question by:gigiotto
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by:pjknibbs
ID: 7116940
I really can't see a legitimate reason you'd want this information--care to enlighten us?
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by:ahoffmann
ID: 7117245
http://www.ripe.net/
It's public somegow, anyway ...
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scott_renton earned 100 total points
ID: 7117685
Yes, sort of.  I think what your looking for is the Classless Internet Domain Routing (CIDR) blocks used by a particular ISP.  These are the "ranges" of IP address used by a particular ISP for their dial up users.

My personal favorite for quick and dirty searches is http://www.arin.net

Put in the adddress you have for a given ISP,  and it will return the address "block" that ISP uses.  Look for the line labeled Netblock in the response.

Hope this helps.
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by:stevenlewis
ID: 7117822
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by:heheman3000
ID: 7118977
or you could just use winipconfig from your own comp and ses the IP block AND the subnet mask without going to all that trouble...
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by:CleanupPing
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gigiotto:
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