Build Port Scanner For Domain Name in Python 3 pyfiglet

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In this tutorial, I’ll use Python 3 and pyfiglet library to create a port scanner for a given domain name in the command line. The complete source code/script is available below.

pip install pyfiglet

code.py

import pyfiglet
import sys
import socket
from datetime import datetime

ascii_banner = pyfiglet.figlet_format("PORT SCANNER")
print(ascii_banner)

# Defining a target
if len(sys.argv) == 2:
  
  # translate hostname to IPv4
  target = socket.gethostbyname(sys.argv[1])
else:
  print("Invalid amount of Argument")

# Add Banner
print("-" * 50)
print("Scanning Target: " + target)
print("Scanning started at:" + str(datetime.now()))
print("-" * 50)

try:
  
  # will scan ports between 1 to 65,535
  for port in range(1,65535):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    socket.setdefaulttimeout(1)
    
    # returns an error indicator
    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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