A simple python script which records and logs wifi probe requests.

wifiscanner.py

import multiprocessing,argparse,chardet
from scapy.all import sniff, Dot11
from mac_vendor_lookup import MacLookup

mac = MacLookup()

def handle_packet(pkt):
    thisProb = {}
    if not pkt.haslayer(Dot11):
        return
    if pkt.type == 0 and pkt.subtype == 4:
        if b"" == pkt.info:
            thisProb["ssid"] = None
        else:
            thisProb["ssid"] = pkt.info.decode(chardet.detect(pkt.info)['encoding'])
        thisProb["src MAC"] = pkt.addr2.upper()
        try:
            thisProb["vendor"] = mac.lookup(thisProb["src MAC"])
        except KeyError:
            thisProb["vendor"] = "unknown manufacturer"

        print(thisProb)




if __name__ == '__main__':
    multiprocessing.freeze_support()

    parser = argparse.ArgumentParser()
    parser.add_argument('--interface', '-i', default='mon0',  # Change mon0 to your monitor-mode enabled wifi interface
                        help='monitor mode enabled interface')
    args = parser.parse_args()
    mac.update_vendors()
    sniff(iface=args.interface, prn=handle_packet)