(adsbygoogle = window.adsbygoogle || []).push({}); Question is in title. I am just curious.

Serial number.

Dont listen to that guy he doesn't know what hes talking about lol (sorry dude) its not mac address or serial number, treyarch banned accounts via ip addresses thats why it affects all your accounts (hacked or not)

Little kid, do not question me. It's sure as hell not IP address, and have no idea what you're talking about.