Nmap is a network scanner created by Gordon Lyon. Nmap is used to discover hosts and services on a computer network by sending packets and analyzing the responses. Nmap provides a number of features for probing computer networks, including host discovery and service and operating system detection.

GitHub: https://github.com/nmap/nmap

Nmap is a built-in tool installed in Kali Linux. You can also install this tool in Ubuntu, by type – ‘sudo apt install nmap   or  sudo apt install net-tools ’.

Let’s see how you can use Nmap in kali Linux…

Note: we will perform all the network scanning over our website and we provides permission to our views to perform same tasks. For other networks without permission from authority will be illegal.

For doing operation over a server, we first need to know itsip-address. For that we can use ‘ping’ command. We will get ip-address like this

Syntax – ping www.yoursite.com

Command 1: ports & stealth scan. Stealth scanning is performed by sending an SYN packet and analyzing the response. If SYN/ACK is received, it means the port is open, and you can open a TCP connection.

  • Syntax: sudo  nmap  -sS  –Pn  ip-address  -vv

Command 2: scans operating system version

Syntax:  sudo  nmap –O  ip-address

Command 3: scans whole system

Syntax:  sudo  nmap –A  -T4  ip-address