In my opinion, bandwidth management is not necessary, since thousands upon thousands of users probably do not have that option. And Guild Wars probably throttles your bandwidth as needed.
And there are probably many servers that ANET runs, and you would need all of them to do that, if you were looking for IP addresses, since you wouldn't know what server you'd be playing on, and I am not sure ANET would give out their server IP addresses. It's just asking for trouble.
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