Port scanner using Python

#!/usr/bin/env python import socket import subprocess import sys from datetime import datetime # Clear the screen subprocess.call('clear', shell=True) # Ask for input remoteServer = raw_input("Enter a remote host to scan: ") remoteServerIP = socket.gethostbyname(remoteServer) # Print a nice banner with information on which host we are about to scan print "-" * 60 print "Please wait, scanning remote host", remoteServerIP print "-" * 60 # Check what time the scan started t1 = datetime.now() # Using the range function to specify ports (here it will scans all ports between 1 and 1024) # We also put in some error handling for catching errors try: for port in range(1,1025): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) result = sock.connect_ex((remoteServerIP, port)) if result == 0: print "Port {}: Open".format(port) sock.close() except KeyboardInterrupt: print "You pressed Ctrl+C" sys.exit() except socket.gaierror: print 'Hostname could not be resolved. Exiting' sys.exit() except socket.error: print "Couldn't connect to server" sys.exit() # Checking the time again t2 = datetime.now() # Calculates the difference of time, to see how long it took to run the script total = t2 - t1 # Printing the information to screen print 'Scanning Completed in: ', total