![]() The RFC column lists the number of the Request For Comment document that defines the particular service or protocol, which may be used for reference. The names of Apple products that use these services or protocols appear in the Used By / Additional Information column. The Service or Protocol Name column lists services registered with the Internet Assigned Numbers Authority except where noted as "unregistered use". Apple products listed in the table are the most commonly used examples, not a comprehensive list. This document is intended as a quick reference and should not be regarded as comprehensive. This article is updated periodically and contains information that is available at time of publication. Note that Mac OS X v10.5 and later include an Application Firewall, which is different than a port-based firewall. Some applications require more than one port and are listed accordingly. Network administrators may also wish to use port-watching software in addition to the information in this article when making decisions about how to set up firewalls or similar access control schemes. Not all ports and services listed are used by all software products. Your network administrator may need this information to make sure your computer or device can connect to services such as automatic software updates, or the App Store. For an explanation of what a TCP or UDP port is, see the "IP Ports" section of " OS X: What Is a Port?" The table below outlines TCP and UDP ports used by Apple products.
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