FTP : 21
SSH : 22
Telnet :23
Smtp: 25
Tftp :69
http: 80
https:443
oracle:1521
sqlserver : 1433
iscsi :3260
QQ: 1080
IT常见端口号熟记
原文：https://www.cnblogs.com/cloud-yongqing/p/11804539.html
