Port Scanner using Python
Last Updated :
08 Dec, 2021
Prerequisites: Socket Programming in Python
This article is just to provide a sample code to generate a Port Scanner. This Port Scanner will work for both the Web Applications as well as remote Host. This tool has been created to provide the basic functionality of a Port Scanner. The general concept of Sockets had been used to provide the functionality. Port Scanner is built on Python 3 and uses some extra libraries such as socket and pyfiglet (for a fancy banner).
Please find the below source code for the Port Scanner :
Source Code
Python3
import pyfiglet
import sys
import socket
from datetime import datetime
ascii_banner = pyfiglet.figlet_format( "PORT SCANNER" )
print (ascii_banner)
if len (sys.argv) = = 2 :
target = socket.gethostbyname(sys.argv[ 1 ])
else :
print ( "Invalid amount of Argument" )
print (" - " * 50 )
print ("Scanning Target: " + target)
print ("Scanning started at:" + str (datetime.now()))
print (" - " * 50 )
try :
for port in range ( 1 , 65535 ):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.setdefaulttimeout( 1 )
result = s.connect_ex((target,port))
if result = = 0 :
print ("Port {} is open ". format (port))
s.close()
except KeyboardInterrupt:
print ( "\n Exiting Program !!!!" )
sys.exit()
except socket.gaierror:
print ( "\n Hostname Could Not Be Resolved !!!!" )
sys.exit()
except socket.error:
print ( "\ Server not responding !!!!" )
sys.exit()
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Output:
Note: In the above code at line 27 i.e for the port in range(1, 65535): you can custom define your ports under which range you have to scan. This port scanner will generally take the time of 2 mins maximum to produce output in the format, that so and so ports are open or closed.
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