port scanner ; Free port open scanner tool in linux (ubuntu )
One of the first step in hacking is port scanning , in which you use port scanner and scan for open ports in a IP address or a server.
A port scanner scans a IP or server and finds open ports in the network using which you can attack the server.
Port scanner are used for hacking and securing a network , Scanning for open ports allows you to see then points through which you can attack the server and thus helps you in both hacking and securing the server.
There are many free port scanner software or tool online , You can also search for a free port scanner for windows and download many softwares.
But in Linux ( Ubuntu ) you get a network tool which you can use as a port scanner already installed in your ubuntu system.
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