Popularly used port numbers

TCP Port	Application
7	Echo - for Ping.
20	FTP data port - for active ftp connections.
21	FTP command
23	Telnet
25	SMTP
53	DNS
79	Finger
80	HTTP (web server)
110	POP3
119	NNTP
161	SNMP
162	SNMP Trap
443	Default port for Secure Socket Layer communications for Web servers (Secure HTTP).
1433	Microsoft SQL-Server.
1521	Port on which the Oracle RDBMS Listener service listens for new connections.
1723	PPTP VPN (used together with protocol 47, GRE)
3389	Microsoft Terminal Server, Remote Desktop client. Windows Remote Assistance.
4899	Microsoft Remote Administrator.
5800	VNC web-browser server listens on port 5800 + display number.
5900	Default port for VNC (display 0). VNC server listens on port 5900 + display number. The VNC viewer connects on the port.
5901	Port used for VNC display 1.
5902	Port used for VNC display 2.
8080	Popular alternative port for HTTP, which is normally served on port 80.

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