Appendix D - Ip Port Numbers - SonicWALL TELE3 SP Administrator's Manual

Appendix D - IP Port Numbers

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.
Well Known Port Numbers
The Well Known Ports are controlled and assigned by the Internet Assigned Numbers
Authority (IANA) <http://www.iana.org> and on most systems can only be used by system
processes, or by programs executed by privileged users. Many popular services, such as Web,
FTP, SMTP/POP3 e-mail, DNS, etc. operate in this port range.
The assigned ports use a small portion of the possible port numbers. For many years the
assigned ports were in the range 0-255. Recently, the range for assigned ports managed by
the IANA has been expanded to the range 0-1023.
Registered Port Numbers
The Registered Ports are not controlled by the IANA and on most systems can be used by
ordinary user processes or programs executed by ordinary users.
While the IANA can not control uses of these ports it does list uses of these ports as a
convenience.
The Registered Ports are in the range 1024-65535.
Visit <http://www.ietf.org/rfc/rfc1700.txt> for a list of IP port numbers.
Page 192 SonicWALL TELE3 SP Administrator's Guide