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Example: List of some well-known and registered port numbers.
The Internet Assigned Numbers Authority (IANA) is the central coordinator for the assignment of
unique parameter values for Internet protocols. Port numbers range from 0 to 65535, but only ports
numbers 0 to 1023 are reserved for privileged services and are designated as “well-known ports”
(Please refer to Table below). The registered ports are numbered from 1024 through 49151. The
remaining ports, referred to as dynamic or private ports, are numbered from 49152 through 65535.
Examples of well-known and registered port numbers are shown below, for further information,
please see IANA’s website at: http://www.iana.org/assignments/port-numbers.
For help on determining which private port numbers are used by common applications on this list,
please see the FAQs (Frequently Asked Questions) at http://www.billion.com.
Table: Well-known and registered Ports
Port Number Protocol
Description
20 TCP FTP Data
21 TCP FTP Control
22 TCP & UDP SSH Remote Login Protocol
23 TCP Telnet
25 TCP SMTP (Simple Mail Transfer Protocol)
53 TCP & UDP DNS (Domain Name Server)
69 UDP TFTP (Trivial File Transfer Protocol)
80 TCP World Wide Web HTTP
110 TCP POP3 (Post Ofce Protocol Version 3)
119 TCP NEWS (Network News Transfer Protocol)
123 UDP
NTP (Network Time Protocol) / SNTP (Simple Network
Time Protocol)
161 TCP SNMP
443 TCP & UDP HTTPS
1503 TCP T.120
1720 TCP H.323
4000 TCP ICQ
7070 UDP Real Audio
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