Swapping ISP

Soldato
Joined
8 Nov 2005
Posts
4,593
A colleague of mine is swapping from Bulldog to Plus.net and during the registration process he's been asked for his MAC address.

I assume that this is the MAC address of the USB modem he was provided at the ntime of initial signup, but why would an ISP need this? What exactly do they do with it?
 
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