Important Port Numbers Session I

Port number is the communication point between the computer and the computer network. All the information. The port number is backed up with TCP or UDP. The computer port number is defined in the Transport Layer of OSI reference model.

Port Description status 0/TCP,UDP Reserved; do not use (but is a permissible source port value if the sending process does not expect messages in response) Official

Port no / Protocol ::: Application

Port: 1 /TCP,UDP ::: TCPMUX (TCP port service multiplexer) Official

Port: 5 /TCP,UDP ::: RJE (Remote Job Entry) Official

Port:7 /TCP,UDP ::: ECHO protocol Official

Port:9 /TCP,UDP ::: DISCARD protocol Official

Port:11 /TCP,UDP ::: SYSTAT protocol Official

Port:13 /TCP,UDP ::: DAYTIME protocol Official

Port:17 /TCP,UDP ::: QOTD (Quote of the Day) protocol Official

Port:18 /TCP,UDP ::: Message Send Protocol Official

Port:19 /TCP,UDP :::: CHARGEN (Character Generator) protocol Official

Port:20 /TCP :::: FTP - data port Official

Port:21 /TCP :::: FTP - control (command) port Official

Port:22 /TCP,UDP ::: SSH (Secure Shell) - used for secure logins, file transfers (scp, sftp) and port forwarding Official