Let’s Build a Network Scanner Using Python

One of the most powerful tools in a cybersecurity professional’s arsenal is a network scanner, which can help identify hosts, open ports, and potential security issues within a network. In this blog post, we’ll embark on a journey to build a simple network scanner using Python.

Paritosh

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Python in Plain English

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3 min read

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Oct 10, 2023

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Prerequisites

Before we dive into coding, let’s ensure we have the necessary tools and knowledge in place:

- Python installed on your system (preferably Python 3).
- Basic knowledge of networking concepts and Python programming.

Choosing the Libraries

Python offers several libraries that can assist in building a network scanner. For this project, we’ll use the Scapy library, a powerful packet manipulation tool that allows us to craft, send, and receive packets.

You can install Scapy using pip:

pip install scapy

Lets write the Code..

Let’s start by creating a Python script that will scan a range of IP addresses for open ports. This script will use Scapy for sending and receiving packets.

import scapy.all as scapy

def scan(ip):
    arp_request = scapy.ARP(pdst=ip)
    broadcast =…