It may be IP first and then by address...only reason I say that is because I tried to hide my IP for Pirates games which worked for about 3 games...then they asked me to reverify my credit card info. Since that point I haven't been able to get any live Pirates games.
I don't know if I'd risk it, but if you really want to see them, you can try.
The One, The Only, The Incomparable Mercer Boy.
blog (updated 6/21 - Pirates walkout.)