>>> Why would that be?
>>
>> ...because every minute of every hour, hundreds of thousands of people 
>> connect to a given ISP and get assigned new IP addresses purely at 
>> random?
> 
> IPs are not given out at random.  Each ISP has a range that they are 
> allowed to assign. The IP address can be tracked back to the ISP.

Yes, I'm well aware of that. I meant they're assigned at random from the 
pool of addresses belonging to that ISP.

> From 
> there, depending what records the ISP keeps, they can probably tell what 
> username was usign that IP at that time.

This is the part that I doubt.

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