How To use Nmap on termux

nmap is a free and open-source 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

First of all,install nmap on your phone through termux

Requirements:

Termux  - Install Termux from Google playstore

After Installing Termux, 

Upgrade the Termux repo to the most recent version,using the command below(Not actually necessary - just to make sure you have the newest termux repository)     

     pkg upgrade

 

 

Open Termux - Android Terminal Emulator App and install nmap on it using the command below:

pkg install nmap 

  

To Test the successfull installation of nmap, type the command 'nmap' or 'nmap -V'

nmap -V

Now, its time to port scan your target ip and find the vulnerable ports,here are the simple commands to try yourself.

nmap - [TARGET_IP] - example: nmap 192.168.1.1

 This is a basic command to scan a range of most common vulnerable ports i.e like http(80),ftp(21),ssh(22),dns(53),telnet(23),File-sharing(139) etc.,

basic nmap command

           

nmap [TARGET_IP] -p 1-65535 - example: nmap 192.168.1.1 -p 1-65535                                   This command will scan all the ports (1-65535 ,i.e 'p' denotes the range of ports to scan )of the target ip.

nmap -Pn [TARGET_IP] -p 1-1024 - example: nmap -Pn 192.168.1.1 -p-1-1024            

    

     Try this command(-Pn) ,if the previous one failed to retrieve data ,this command will scan the target even if it is a firewalled device, like nmap can scan a range of ports even if your target ip blocks the ping requests etc.,

                       

If this error occurs, try this command - nmap -Pn [TARGET_IP] 

You can also scan multiple ip - example: nmap 192.168.0.1-254 or nmap 192.168.1.1,2 or /16 /24 etc.,

You can do lot more with nmap, simply type nmap -h to find more interesting available options or have a look into the documentation of nmap.