One host computer can run more than one server program. For example, a small ISP
might have one computer running a POP server, SMTP server, web server, and news
server. To keep requests for information straight, each type of server responds to
packets sent to specific ports (input for a specific Internet service). Ports are numbered,
and standard port numbers used throughout the Internet. You almost never need to
type port numbers, but here are some widely used port numbers in case you do:
Port Number Internet Service
21 FTP (file transfer)
23 Telnet (remote login)
25 SMTP (mail relaying)
80 World Wide Web
110 POP3 (storage of incoming mail)
194 (as well as 6667 and many others) IRC (online chat)
532 Usenet newsgroups (discussion groups)
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