ISP users and their IP address

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?
gigiottoAsked:
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scott_rentonConnect With a Mentor Commented:
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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pjknibbsCommented:
I really can't see a legitimate reason you'd want this information--care to enlighten us?
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ahoffmannCommented:
http://www.ripe.net/
It's public somegow, anyway ...
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stevenlewisCommented:
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heheman3000Commented:
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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gigiotto:
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