Port Scanner With Python
A Simple Port Scanner Using Python.
2 min readMar 16, 2021
Sometimes we need to scan for open ports on a machine or host for our work or for security. We mostly use Nmap or any other port scanner for this work.
But sometimes all we need is a simple port scanner, not a complicated one. So in this article, we are going to create our own port scanner with python.
Let’s Build One
Port Scanner is built on Python 3 and uses some extra libraries such as socket and pyfiglet(For Banner).
import pyfiglet
import sys
import socket
from datetime import datetimeascii_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 ammount 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 Exitting Program !!!!")
sys.exit()
except socket.gaierror:
print("\n Hostname Could Not Be Resolved !!!!")
sys.exit()
except socket.error:
print("\ Server not responding !!!!")
sys.exit()
If you like to build things with Python then check out our article on browser automation with python.
