Appendix C. Common Ports

The following tables list the most common communication ports used by services, daemons, and programs included in Red Hat Enterprise Linux. This listing can also be found in the /etc/services file. For the official list of Well Known, Registered, and Dynamic ports as designated by the Internet Assigned Numbers Authority (IANA), refer to the following URL:

http://www.iana.org/assignments/port-numbers

Table C.1, “Well Known Ports” lists the Well Known Ports as defined by IANA and is used by Red Hat Enterprise Linux as default communication ports for various services, including FTP, SSH, and Samba.

Table C.2, “UNIX Specific Ports” lists UNIX-specific ports and cover services ranging from email to authentication and more. Names enclosed in brackets (for example, [service]) are either daemon names for the service or common alias(es).

Table C.3, “Registered Ports” lists ports submitted by the network and software community to the IANA for formal registration into the port number list.

Table C.4, “Datagram Deliver Protocol Ports” is a listing of ports related to the Datagram Delivery Protocol (DDP) used on AppleTalk networks.

Table C.5, “Kerberos (Project Athena/MIT) Ports” is a listing of ports related to the Kerberos network authentication protocol. Where noted, v5 refers to the Kerberos version 5 protocol. Note that these ports are not registered with the IANA.

Table C.6, “Unregistered Ports” is a listing of unregistered ports that are used by services and protocols that may be installed on your Red Hat Enterprise Linux system, or that is necessary for communication between Red Hat Enterprise Linux and other operating systems.