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 thr o ugh 65535.
Well Known Port Numbers
Well Known Ports are controlled and assi gned by th e Intern et As sign ed Num bers Autho rity (IANA )
<http://www.i an a .o rg> and on m o st s ys te ms ca n o nl y be u se d by s y s tem processes, or by pro gra ms
executed by privileged users. Many popular services, such as Web, FTP, SMTP/POP3 e-mail, DNS,
etc. operate in this po r t r a ng e.
The assigned ports use a s mall portion of the possible port numbers. For many years the assigned
ports were in the range 0- 255. Re cently, t he range for assign ed por ts manag ed by the IANA ha s
been expanded to the range 0-1023.
Registered Port N u mb e rs
Registered Ports are not controlled by the IANA and on most systems can be used by ordinar y use r
processes or programs e xecuted by ordinary users.
While the IANA can not control uses of these ports it does li st uses of the se port s as a conveni en ce.
The Registered Ports are in the ran ge 102 4- 655 35.
Visit <http://www.ietf.org/rfc/rfc1700.txt> for a list of IP port numbers.