If you’re a Mac user, you might consider using the KisMAC stumbler and security tool, similar to Kismet. It also reveals “hidden” SSIDs. Along with the other basic details, it can show the AP’s clients (with MAC Addresses, IP addresses and signal strengths). Plus it reports the noise levels and gives you the signal-to-noise (SNR) values. It also supports GPS and mapping, and PCAP import and export. It even includes tools to attack Wi-Fi networks for penetration testing.
Geier is a freelance tech writer—become a Twitter follower to keep up with his writings. He’s also the founder of NoWiresSecurity, which helps businesses easily protect their Wi-Fi network with Enterprise (802.1X) security.