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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 5). 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.
For further information, please see IANA’s website at http://www.iana.org/assignments/portnumbers
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 5: Well-known and registered Ports
Port Number
Protocol
20
21
22
23
25
53
69
80
110
119
TCP
TCP
TCP & UDP
TCP
TCP
TCP & UDP
UDP
TCP
TCP
TCP
123
UDP
161
443
1503
1720
4000
7070
TCP
TCP & UDP
TCP
TCP
TCP
UDP
Description
FTP Data
FTP Control
SSH Remote Login Protocol
Telnet
SMTP (Simple Mail Transfer Protocol)
DNS (Domain Name Server)
TFTP (Trivial File Transfer Protocol)
World Wide Web HTTP
POP3 (Post Office Protocol Version 3)
NEWS (Network News Transfer Protocol)
NTP (Network Time Protocol) / SNTP (Simple Network
Time Protocol)
SNMP
HTTPS
T.120
H.323
ICQ
RealAudio
148