sniff-probe-req is a software allows you to sniff the Wi-Fi probe requests passing near your wireless interface.

Probe requests are sent by a station to elicit information about access points, in particular to determine if an access point is present or not in the nearby environment. Some devices (mostly smartphones and tablets) use these requests to determine if one of the networks they have previously been connected to is in range, leaking personal information.

sniff-probe-req v0.5.1

Dependencies; This software requires Python 3 and the following dependencies:
+ argparse
+ netaddr
+ scapy

Use and Download:

git clone https://github.com/SkypLabs/sniff-probe-req && cd sniff-probe-req
pip install -r requirements.txt
cd bin
./sniff-probe-req -h

or using pip
pip3 install --upgrade sniff-probe-req
sudo sniff-probe-req -i wlan0

Source: https://github.com/SkypLabs