NPort 5000 Series User Manual
C. Well-Known Port Numbers
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 the NPort 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 Port Service Multiplexor
SMTP (Simple Mail Transfer Protocol)
Host name server (names server)
(Login Host Protocol) (Login)
Domain Name Server (domain)
Network news Transfer Protocol (NNTP)
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