nmap script to detect proxy servers

The following nmap script can be used to detect proxy servers on a network. Typically proxy servers work on TCP port 8080. nmap can be used to scan a network for TCP port 8080. The following command shows the appropriate
script to be used with nmap.

nmap -p T:8080

The above command scans the network for TCP port 8080 and displays the IP addresses which have the port open.

Learn to make custom tools and scripts with Python – Python Network programming