NC-瑞士军刀NetCat

root@kali:/# nc -v pop3.163.com 110　　　　//-v详细显示
DNS fwd/rev mismatch: pop3.163.idns.yeah.net != m12-110.163.com
pop3.163.idns.yeah.net [220.181.12.110] 110 (pop3) open
+OK Welcome to coremail Mail Pop3 Server (163coms[726cd87d72d896a1ac393507346040fas])

root@kali:/# nc -nv 192.168.220.1 902　　//-n直接跟IP，不做DNS解析
(UNKNOWN) [192.168.220.1] 902 (?) open
220 VMware Authentication Daemon Version 1.10: SSL Required, ServerDaemonProtocol:SOAP, MKSDisplayProtocol:VNC , , NFCSSL supported/t