C
C. Well-Known Port Numbers
In this appendix, we provide a list of well-known port numbers that may cause network problems if you set the
NPort 6000 to one of these ports. Refer to RFC 1700 for well-known port numbers or to the following
introduction from the IANA:
The port numbers are divided into three ranges: the Well-Known Ports, the Registered Ports, and the Dynamic
and/or Private Ports.
The Well-Known Ports range from 0 through 1023.
The Registered Ports range from 1024 through 49151.
The Dynamic and/or Private Ports range from 49152 through 65535.
The Well-known Ports are assigned by the IANA, and on most systems, they can only be used by system
processes or by programs executed by privileged users. The following table shows famous port numbers
among the listed well-known port numbers. For more details, please visit the IANA website at
http://www.iana.org/assignments/port-numbers
.
TCP Socket Application Service
0 Reserved
1 TCP Port Service Multiplexer
2 Management Utility
7 Echo
9 Discard
11 Active Users (systat)
15 Netstat
20 FTP data port
21 FTP control port
23 Telnet
25 SMTP (Simple Mail Transfer Protocol)
37 Time (Time Server)
42 Host name server (names server)
43 Whois (nickname)
49 Login Host Protocol (login)
Domain Name Server (domain)
79 Finger protocol (finger)
80 World Wide Web (HTTP)
119 Network News Transfer Protocol (NNTP)
123 Network Time Protocol
213 IPX
160 to 223 Reserved for future use
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