20
21 | (standard) A personal FTP server, part of AppleShare IP products. Anonymous users gets the same privileges as MacOS "Guest" accounts. |
| 25 | (standard) AppleShare SMTP server |
| 53 | (standard) MacDNS |
| 79 | (standard) Finger daemon, also used for mail notification. |
| 80 | (standard) Personal Web Sharing web service runs by default on this port, part of AppleShare IP. |
| 106 | (standard) AppleShare POP3 password change |
| 110 | (standard) AppleShare POP3 server, supporting APOP |
| 123 | (standard) NTP, used in MacOS 8.5+ in the Data & Time Control Panel |
137
138
139 | (standard) Windows File and Print sharing |
| 143 | (standard) AppleShare IMAP4 server, support RFC 2086 ACL. |
| 515 | (standard) Printer sharing |
| 311 | AppleShare IP 6.0 remote WebAdmin |
| 389 | (standard) Sherlock 2 LDAP |
| 548 | AFP (Apple File Protocol), also known as Personal File Sharing via IP. This port is used with Apple's "iDisk" feature, which allows Macintoshes to store files on Apple's site across the Internet, so TCP connections to this port should be allowed through a firewall. |
| 626 | AppleShare IMAP administration port. |
| 660 | Mac OS web and file administration for AppleShare IP 6.3 and later. |
| 687 | AppleShare IP Registry (for Shared Users and Groups administration) |
| 3283 | Network Assistant |
A number of port numbers are specific to MacOS X because of its UNIX/BSD heritage.
QuickTime is Apple's "multimedia" product. It is primarily used for audio/video streaming (like movies on the web), but can also be used for videoconferencing.
Older version of MacTCP would allocate dynamic ports starting at 256 rather than 1025 like all other machines, so older clients will have ports in the low range.
