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Appendix A. Well Known Port Numbers
This appendix is included for your reference. Listed below are port numbers that already have a
well-established use. These port numbers should be avoided when assigning a port number to your
NE-4100 Series module; otherwise you may experience network problems. Refer to the RFC 1700
standard for Well Known Port Numbers or refer to the following introduction from 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 are those from 0 through 1023.
The Registered Ports are those from 1024 through 49151.
The Dynamic and/or Private Ports are those from 49152 through 65535.
The Well Known Ports are assigned by 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 Protocol)
37 Time (Time Server)
42 Host name server (names server)