MAC address randomization in Wi-Fi-enabled devices has recently been adopted to prevent passive tracking of mobile devices. However, Wi-Fi frames still contain fields that can be used to fingerprint devices and potentially allow tracking. Panoptiphone is a tool inspired by the web browser fingerprinting tool Panopticlick, which aims to show the identifying information that can be found in the frames broadcast by a Wi-Fi-enabled device. Information is passively collected from devices that have their Wi-Fi interface enabled, even if they are not connected to an access point. Panoptiphone uses this information to create a fingerprint of the device and empirically evaluate its uniqueness among a database of fingerprints. The user is then shown how much identifying information its device is leaking through Wi-Fi and how unique it is.