Description: KisMAC is an open-source and free sniffer/scanner application for Mac OS X. It has an advantage over MacStumbler / iStumbler / NetStumbler in that it uses monitor mode and passive scanning.
KisMAC supports many third party USB devices: Intersil Prism2, Ralink rt2570, rt73, and Realtek rtl8187 chipsets. All of the internal AirPort hardware is supported for scanning.
The rest of this wiki assumes you are prepared for advanced topics and know what you are doing with your system.
this video is simple demo of wifi cracking with kismac
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it performs passive scanning and also Shows logged in clients with MAC Addresses, IP addresses and signal strengths.
its a mac tool but very powerful i have used this tool in my macbook pro :D