Common port Numbers

A very important field in the packet format of the network layer---packet is called the protocol number. For example, if the transport layer is a TCP connection, then the protocol number in the network layer IP packet will have a value of 6, if it is UDP, then that value is the---transport layer.

The Transport layer------the application layer through the Interface Association (the field of the port is called the port). Use netstat–an  to view the port numbers that are open to the machine. The following ports are commonly used by proxy servers: (1).  http protocol Proxy Server Common port number: 80/8080/3128/8081/9080 (2).  socks Proxy Protocol Server common port number: 1080 (3). FTP (File Transfer) protocol Proxy Server Common port number: 21 (4). Telnet (remote login) protocol proxy Server Common port: 23 http server, default port number is 80/tcp (Trojan executor open this port); HTTPS (securely transferring Web pages) server, The default port number is 443/tcp 443/udp;telnet (unsafe text transfer), the default port number is 23/tcp (Trojan tiny Telnet Server open port), FTP, the default port number is 21/tcp (Trojan Doly Trojan, Fore, Invisible FTP, WebEx, Wincrash, and Blade Runner); TFTP (Trivial File Transfer protocol ), the default port number is 69/UDP SSH (Secure login), SCP (file transfer), port redirection, the default port number is 22/tcp;smtp simple mail Transfer Protocol (e-mail), the default port number is 25/tcp (Trojan antigen, Email Password Sender, Haebu Coceda, Shtrilitz Stealth, WINPC, winspy all open this port); POP3 Post Office Protocol (e-mail)   The default port number is 110/tcp;weblogic, the default port number is 7001;webshpere application, the default port number is 9080;webshpere administration tool, the default port number is 9090;jboss, the default port number is 8080 TOMCAT, the default port number is 8080;win2003 remote login, the default port number is 3389;symantec av/filter for mse&nbsp, the default port number is  8081;Oracle  database, The default port number is 1521;oracle Emctl, and the default port number is1158;oracle XDB ( XML  database), the default port number is 8080;oracle XDB FTP service, the default port number is 2100;MS sql*server database server, the default port number is 1433/ TCP 1433/udp;ms Sql*server database monitor, the default port number is 1434/tcp 1434/UDP;QQ, the default port number is 1080/UDP

Common port numbers