Wireless guest-net IP before login

We have a wireless guest net and we broadcast it thru-out our hospital.
The problem is with all the IPAD's, IPHONE's, ADROIDS and such roaming
around the hospital we are using all of our Class C IP addresses. Is there a way setup
the WISM to keep the clients  from getting an IP before the client logins? 

yea, i feel your pain ... We have 2000 guest daily here at our hospital and as you know people just walking by with wifi devices will get an IP.
One way -- Don't broadcast your SSID. Clients would need to manually join your network and then get an IP.
No other way around it in an open "hot spot" easy to access kinda way.
Im sure thats not what you wanted to hear ...
edit: Another way is to open a much larger scope. We have a /21 here and it works fine. We show as many as 3000 scopes out but normally only have 500 - 2000 users AT MAX ... We also shorten the DHCP scopes to 3 hours.

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