Tracking Users By IP Address

[Michael Ströder]

Grant Edwards wrote:
> On 2004-10-07, Fuzzyman <fuzzyman at gmail.com> wrote:
> 
>>Assuming that each visitor will have a unique IP address is
>>probably not 100% accurate but will have a reasonably low
>>margin of error!!
> 
> Not.  A significant portion (I'd guess a vast majority) of the
> machines out there have either dynamically allocated IP
> addresses or are behind a proxy or NAT firewall.

Even worse: HTTP proxy networks (e.g. AOL) will make hits in one session 
from the very same user appear with *different* IP addresses.

Ciao, Michael.