User Manual

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Well Known Port Numbers
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In this appendix, which is included for your reference, we provide a list of Well
Known port numbers that may cause network problems if you set NPort 5200 to one
of these ports. Refer to RFC 1700 for Well Known port numbers, or refer 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, can only be
used by system processes or by programs executed by privileged users. The following
table shows famous port numbers among the 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 Multiplexor
2 Management Utility
7 Echo
9 Discard
11 Active Users (systat)
13 Daytime
15 Netstat
20 FTP data port
21 FTP CONTROL port
23 Telnet
25 SMTP (Simple Mail Transfer
37 Time (Time Server)
42 Host name server (names server)
43 Whois (nickname)