Originally posted here by phishphreek80
Airsnare will look for wlan cards and report their MAC addresses to you. You can flag the MACs reported back to you as trusted or untrusted and "watch" them.
http://home.comcast.net/~jay.deboer/airsnare/

You could also use something like KISMET. There is a feature that will allow you to resolve the hosts.

A lot of routers will let you view the DHCP client list. That only helps they all have dynamic IPs. If they have static, it won't help you. Some routers will let your view wifi clients instead of just the dhcp clients.

Or, a simple ping scan or arp scan of your subnet should reveal the hosts. As long as they are responding to ping or arp,

(nmap, ettercap, Cain and Abel)
Airsnare looks cool.... Nmap and Cain scanning it is offensive? Noob here trying to secure WLAN...