Port Scanning Under the hood

In this post we see what happens in the process of port scanning the technology used and many more !

When we hear Port Scanning the first tool that comes in our mind is Nmap.

well how does Nmap pulls off such task ?! ,basically "WHAT HAPPENS UNDER THE HOOD ?"

• What is Nmap?

Nmap stands for Network Mapper which is a free Open source command-line tool. Nmap is an information-gathering tool used for recon reconnaissance. It scans hosts and services on a computer network which means that it sends packets and analyzes the response. Listed below are the most useful Scans which you can run with the help of Nmap tools.

• Basic Syntax

nmap [Scan Type] [Options] {Target}

nmap -sT 192.168.1.12 --top-ports 50

Here:

• -sT is used for TCP Scan.

• --top-ports is used to give top ports which are used to give the number of ports. Here we give 50 which means the top 50 ports which are most used in TCP.

• 192.168.1.12 is the Destination IP. You can also give the Destination URL.