Port scanning
Scan ports between 21 to 25
$ nc -zvn 192.168.1.1 21-25
Scan ports 22, 3306 and 8080
$ nc -zvn 192.168.1.1 22 3306 8080
Comments
Scan ports between 21 to 25
$ nc -zvn 192.168.1.1 21-25
Scan ports 22, 3306 and 8080
$ nc -zvn 192.168.1.1 22 3306 8080