Filter
Top Products
Page 268 SonicWALL Internet Security Appliance Administrator’s Guide
Appendix D - IP Port Numbers
The port numbers are divided into three ranges: Well Known Ports, Registered Ports, and Dynamic
and/or Private Ports.
Well Known Ports range from 0 through 1023.
Registered Ports range from 1024 through 49151.
Dynamic and/or Private Ports range from 49152 through 65535.
Well Known Port Numbers
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
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.