Okay.. Say that I made an account under ip 12345 yea? then i used it without proxy for say.. 3 months? then i decided to use a proxy which is 12346.. If I get iced the first time i use it, which one will be iced? 12345 or 123456?
I think they'd ice both, because they are logged on that one account. If that's what you're asking =P But chances are..they might ice the one that was on that account the most.
All ip address are saved to accounts, so if you logged in or signed up on a dodgey ip address chances are your gonna be frozen, weather you change your ip or not.
How longs a piece of string... Peoples ip address can change every tim they restart there laptop/pc, so i would image that had decent facilities to save ips for a long time