# nc -z -w 2 xxxx.com 1-1000 Connection to xxxx.com 21 port [tcp/ftp] succeeded! Connection to xxxx.com port [tcp/http] succeeded! Connection toxxxx.com port [tcp/epmap] succeeded! Connection to xxxx.com139 port [tcp/netbios-ssn] succeeded! Connection to xxxx.com 443 port [tcp/https] succeeded! Connection toxxxx.com 445 port [tcp/microsoft-ds] succeeded! Connection to xxxx.comc 990 port [tcp/ftps] succeeded!