Scan IP address using command line

Nmap is a free and open-source security scanner, originally written by Gordon Lyon, used to discover hosts and services on a computer network, thus building a "map" of the network. Obviously, Nmap or nmap can be used to scan IP address of your HPC cluster network.


1. Install nmap package.

The following commands to install nmap on RHEL-based and Ubuntu, respectively.

sudo yum install nmap
sudo apt-get install nmap

2. Check version

nmap --version

3. Scan IP address

  • For nmap version 6.x or higher 
 nmap -sn 192.168.1.1/4

This will scan from 192.168.1.1 to 192.168.1.4

  • For nmap version 5.x or lower 
nmap -sP 192.168.1.1/4

This will scan from 192.168.1.1 to 192.168.1.4


More details of nmap can be found on its official website: nmap.org


Rangsiman Ketkaew