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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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