Simple port scanner

A port scanner is designed to examine a server or host machine for open ports. It helps the attackers to identify the service running on the host machine and exploit the vulnerabilities, if there are any.

Getting ready

We can write a simple port scanner with Python using the socket module. The socket module is the default low-level networking interface in Python.

How to do it...

We can create a simple port scanner with the socket module, following are the steps:

1. Create a new file called port-scanner.py and open it in your editor.
2. Import the required modules, as follows:

import socket,sys,os

Import the socket module along with the sys and os modules

3. Now we can define the variables for our scanner:

host = 'example.com' 
open_ports =[] 
start_port = 1 
end_port = 10

Here we define the starting and ending ports that we plan to scan

4. Get the IP from the domain name:

ip = socket.gethostbyname(host)

Here we use the gethostbyname method in the socket module. This will return the IP of the domain...