I need a network scanner for Mac OS?

I wanna scan my local network block. no apple's network utility won't do the job. under windows i used softperfect network scanner, http://www.softperfect.com/products/networkscanner/, so i'm looking for something like that. I just want to see how many people are using my open wireless network and are... show more I wanna scan my local network block. no apple's network utility won't do the job. under windows i used softperfect network scanner, http://www.softperfect.com/products/netw... so i'm looking for something like that. I just want to see how many people are using my open wireless network and are currently connected to it.
Update: let me clarify, i don't want to know how many people have connected to my router, i want to know how many people are currently connected. the dhcp on my router never expires, i'm trying to ping to see how many are actually connected.
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