Displaying DHCP total, but excluding 1 network?

We are starting to run out of Public IP’s so we’re putting a few customers on private IP’s and natting them. I have the dude show me total DHCP leases so I know when I get close to running out of public IP’s, but with the introduction of privates it throws the calculation off.

Is there a way to show total leases from just one subnet, or exclude a subnet all together? I’m still using the old 3.6v of Dude if that makes a difference.