Recon-Informer is a basic real-time anti-reconnaissance detection tool for offensive security systems, useful for penetration testers. It runs on Windows/Linux and leverages scapy.
You can download it from the following link: https://packetstormsecurity.com/files/download/156971/Recon-Informer.py.txt
Source: https://packetstormsecurity.com/files/156971/Recon-Informer.html