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How to Use Nmap – Command to Scan Network Tutorial Guide (Part-1)

What is Nmap?

At its core, Nmap is a network scanning tool that uses IP packets to identify all network devices and provide information about the services and operating systems they use.

The system is widely used with a command line interface (although earlier GUI conclusions are available) and is available on many operating systems such as Linux, free BSD, and Gentoo. Its reputation has also been strengthened by an active and enthusiastic user support community.

The rise of IoT, in particular, now means that the networks used by these companies have become more complex and therefore difficult to protect.

This means that Nmap is now used in many website monitoring tools to test traffic between web servers and IoT devices. The recent emergence of IoT bots, like Mirai, has also aroused interest in Nmap, not least because of its ability to detect devices connected to the UPnP protocol and to highlight any potentially malicious devices.

Also Read : Create & Host Your Own Dark Web Onion Website on Termux & Linux 

How to use Nmap

Nmap is straightforward to use, and many of the tools it provides are familiar to system administrators from other applications. The advantage of Nmap is that it brings a lot of these tools into one system, rather than forcing you to skip between different and different network monitoring tools.

To use Nmap, you need to familiarize yourself with the command line links. Most advanced users are able to write scripts to perform normal tasks automatically, but this is not required for basic network monitoring.

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How To Install Nmap

The process of installing Nmap is simple but varies depending on your operating system. Windows, Mac, and Linux versions of the program can be downloaded here.

Install Linux & Termux

 apt install nmap -y 


Nmap Command List :

1. Scanning System with hostname and IP address. First, Scan using Hostname

nmap www.onlinehacking.in

Now let’s scan using IP Address


The nmap command allows you to scan the system in various ways. For this we do scanning using the host name such as “onlinehacking.in” and the web address “”, to find all openings, services, and MAC addresses in the system.


2. To using scan “-v” option. Advanc option scan

nmap -v www.onlinehacking.in



3. Scan most strangers


nmap onlinehacking.in onlinehacking.xyz onlinehacking.org

We can scan multiple hosts by typing IP addresses or nmap host names.


4. Scanning the entire subnet

We can scan the entire subnet or IP range with a nmap by providing a “*” for it. It will scan the entire subnet and provide information about the Top Network hosts.

nmap 104.21.71.*


5. Firewall Information Scanning to find security system settings .

Finding firewall settings can be helpful during login testing and risk scanning.  To view it we use the “-sA” option. This will provide you with information about active firewall on the host. Uses ACK scanning for information.

sudo nmap -sA

sudo nmap -v -sA


6. To scan a file

If we have a long list of addresses that we need to scan, we can import the file directly through the command line. It will generate a scan of the given IP addresses.

nmap -iL input.txt


7. Get OS Information

Nmap is an ideal choice for many when it comes to remote OS acquisition. Flag -A tells Nmap to find and display OS information about the hosts you are testing.

nmap -A
nmap -A -v

So you can add a v flag for more information on your search result. It is a great way to execute Nmap commands for beginners. The command below is to show you how to get the OS information of the hosts who live on file.

nmap command


8. Here -A Shows Offer will inform Information such as OS ( -O ) detection, translation detection, text scan (-sC), and traceroute (-craceroute) even provides a lot of important information about the Host.

nmap -A <Domain Name>

nmap command


9. Here It Will Show The Application When The Domain Or IP Address Is Active But Will Not Show The Real Operating System Available On The Computer. Will Only Display Operating System Online. This will automatically guess the operating system (OS) in the home.

nmap -O <Domain Name>


10. Consult Nmap Documentation

As Nmap has grown so much over time, it is very difficult to remember all its beginnings. Fortunately, Nmap documents provide excellent information to help get users started on this issue.

Also Read : How to Hack WhatsApp Using Meterpreter in Linux & Termux

The first command will give you all the available Nmap options. You can check the manual for more details using the last one.

nmap --help


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