do ISPs keep track of end-user IP changes within thier network?

[explanoit.nanog at explanoit.com (explanoit)]

Another question:
I would think that the systems that keep the logs get backed up to 
tape, right? Wouldn't this mean the data is kept for years off-site? Do 
they not offsite backup the access logs ever?

Regards,
explanoit

On 2013-12-11 21:59, Carlos Kamtha wrote:
> Hi,
> 
> just a general curiousity question. it's been a long time since ive
> worked at an ISP.
> 
> back then it was non-expiring DHCP leases and in some cases static IP
> for all.. (yes it was long ago..)
> 
> Any feedback would be greatly appreciated..
> 
> Carlos.