how to grant permission for a group of people to join when 1 person pays for access..

[first5.0]

I am thinking of starting a forum where a company can pay a fee to allow their employees to have access to the forums.

So once the corporate entity pays for access all of their employees can join.

How can I manage this?

Let's say I have a public forum (Free access) and a private forum (paid access). I'm pretty sure 3.5 allows paid subscription to forums but how do you allow more than 1 person join from 1 payment?

Is it possible to block access to a specific forum according to a range of IP addresses?
So everyone in the world is blocked from the private forum until their corporate entity pays for access. Then I find the IP addresses that are associated with their entity and allow access to that range of IP addresses.

Is this feasible or should I look in to having something created to allow this?