What Is Well Known Ports?
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Well known ports are network port numbers used by Internet services that are associated with common types of applications. These ports are usually assigned by the Internet Assigned Numbers Authority (IANA). Well–known ports typically range from 0 to 1023. Commonly used protocols include FTP (20 and 21), SSH (22), Telnet (23), SMTP (25), HTTP (80), POP3 (110), IMAP (143), and HTTPS (443).