Nmap stands for Network Mapper. Nmap was designed to be a free utility for network exploration or security auditing. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use.It was designed to rapidly scan large networks, but works fine against single hosts.
Let us take a simple scenario to learn more about nmap
Say a a thief wants to steal something from house , then as a very first step, he wants to find the location from where he can get himself into house, similar to that nmap performs same thing for you. It scans all the ports(It is a entry point in simple terms) where a host is listening ,and lists them
In order to scan a host you have to perform following steps
1:- Open CMD prompt
2:- type nmap.exe -sS -F <hostname>
Press enter , it will lists all the port where a server is listening
You can download it from here
Click here
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