ACTIVE RECONNAISSANCE:USING NMAP FOR INFORMATION GATHERING!!!

                         Open source tool Nmap is a popular choice amongst hackers and security pros. It is the first choice to perform active reconnaissance.

WHAT IS RECONNAISSANCE??

The word reconnaissance is borrowed from its military use, where it refers to a mission into enemy territory to obtain information.In computer reconnaissance generally means the act of knowledge gathering by hackers.It involves the act of scanning a machine for open ports and services associated with them.

LETS START!

Nmap is the most popular tool used by hackers for reconnaissance.It comes inbuilt in Kali linux and Parrot Security OS. If you are using any other Linux based OS like Ubuntu, you can install it by

 sudo apt-get install nmap

To check if nmap has been installed type  ' nmap ' and press Enter.

{ Do this in root ( try ' sudo -i ')}

If Nmap is installed correctly you will see :

Now that you have installed Nmap lets start the real thing.

1.TCP SYN scan-

It is a form of stealth scan that checks for open ports.

        nmap -sS [ip address of machine to scan}

Eg. nmap -sS 192.168.0.1

2.OS Detection-

It checks for the Operating System.

             nmap -O [ip address] 

Eg. nmap -O 192.168.0.124

3.Scan for a specific port range:

           nmap 192.168.0.1 -p25-150

-p takes port range as input.

 

I showed  you three basic uses of Nmap . This blog is for tutorial only . Always follow the rules and become a White Hat Hacker . Read the nex part of the tutorial from here. If you have any problem comment below and subscribe my blog for more cool posts.