QUOTE (klaude)
The only limit is the number of IP addresses your OS can support.

Thanks Kevin,
Is the process of obtaining IP addresses very straightforward (e.g. just a matter of paying for them)?
Or do you have to do the "ARIN Justification" thing each time like with some other data centers, which can be kind of impossible when you want to have IP addresses ready before future virtual hosting clients sign up, and you don't know what domains they're going to be using, but you don't want to wait until they sign up and then order IP addresses which delays the account setup process, etc etc...