How to use nmap to scan Network IP under Linux

Editor to share with you how to use nmap to scan network IP under Linux, I believe most people don't know much about it, so share this article for your reference. I hope you can learn a lot after reading this article. Let's learn about it together.

Nmap is called Network Mapper. Is a very useful tool for network scanning and host detection. Nmap is not limited to just collecting information and enumerations, but can also be used as a vulnerability detector or security scanner.

Install nmap:$ sudo yum install nmap [in RedHat-based systems] $sudo dnf install nmap [in Fedora 22 +-based versions] $sudo apt-get install nmap [in Debian/Ubuntu-based systems]

After the installation is complete, the syntax used is:

$nmap [scan type...] Options {target specification}

The parameter {target specification} can be replaced by hostname, IP address, network, and so on.

So to list the IP addresses of all hosts connected to a given network, first use the ifconfig command or the ip command to identify the network and its subnet mask:

$ifconfig or $ip addr show

Find network details in Linux

Next, run the Nmap command as follows:

$nmap-sn 10.42.0.0 Universe 24

Find all active hosts on the network

In the above command:

-sn-is the type of scan. Here is the scan in ping mode. By default, Nmap uses port scanning, but such scanning disables port scanning. 10.42.0.0Comp24-is the target network and is replaced with your actual network.

For comprehensive information, check out the Nmap manual:

$man nmap

Or run Nmap directly without any parameters to view the summary of usage information:

$nmap

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