Connection to host.example.com 25 port [tcp/smtp] succeeded! The port range was specified to limit the search to ports 20 - 30, and is s der (unless the -r flag is set). You can also specify a list of ports to scan, for example: $ nc -zv host.example.com http 20 22-23 nc: connect to host.example.com 80 (tcp) failed: Connection refused nc: connect to host.example.com 20 (tcp) failed: Connection refused Connection to host.example.com port [tcp/ssh] succeeded! nc: connect to host.example.com 23 (tcp) failed: Connection refused The ports are scanned by the order you given (unless the -r flag is set). Manual page nc(1) line 219/313 84% (press h for help or q to quit)
