Monitor Total IP addresses used?

I know how to pull up the total DHCP leases through snmp but I have many statics that get used also. Is there some way I can pull data to show me how many of my IP’s are being used and display them in a dude device?

nmap with the zenmap gui is an excellent tool for ping sweeping. Your best bet is to build a script/external that is ran as a service once an hour.