Tech Star

Hi 🙂 This is about a simple port scanner which searches for the open ports for a given IP address. It uses python socket module. Script uses python version 3.

import socket 
import sys

start_port = 1
end_port = 65535

try:
    for port in range(start_port, end_port):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        socket.setdefaulttimeout(1)
        host =  socket.gethostbyname(sys.argv[1])# take IP of host as input
        result = s.connect_ex(host, port)
        if result == 0:
            print("port {} is open".format(port))
        s.close()
except Exception as ex:
    ################### check exception details ######################
    template = "An exception of type {0} occurred. Arguments:\n{1!r}"
    message = template.format(type(ex).__name__, ex.args)
    print (message)
    print('exception caught')
    sys.exit()
     

How to run this script:

$ python scanner.py <host IP>

Cheers !