Kismet is a wireless network and device detector, sniffer, wardriving tool, and WIDS (wireless intrusion detection) framework.
Kismet works with Wi-Fi interfaces, Bluetooth interfaces, SDR (software-defined radio) hardware like the RTLSDR, and other specialised capture hardware.
Use Kismet to find and monitor nearby Wi-fi Devices:
ip a or ifconfig
sudo airmon-ng start wlan0
ip a
sudo kismet -c wlan0