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For example the US cable co roadrunner could dynamically allocate you a 24.x or a 65.x another example is aol where you could get 152.x or a 205.x or 172.x etc....
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as i mentioned before in this case the DNS will show the same for the company or ISP
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the person browsing is using a proxy
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Again, each user will have a limit of 10/15/or 20 ips/day, and after at least a week of recording the ips, you will know if thats a regular ip (or proxy) used by that user.
And why are you making it so complicated, take life easy, how many people will use a proxy? and if you find someone using a proxy s/he will probably use it forever (instead of showing the regular ip) not only for my vB!
take the idea of the script easy...start by understanding the need for detecting 2 users logging at the same time with the same account...don't go further...at least for now
cheers,