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Port Usage Reference Notes
20 FTP Data RFC 959 Only used as a source port
21 FTP Control RFC 959
23 Telnet RFC 854 Common port for attacks
25 SMTP (email) RFC 821, 822
53 DNS RFC 1034, 1035 Mainly uses UDP, not TCP
70 Gopher RFC 1436
79 Finger RFC 1288
80 HTTP (Web) RFC 1945
88 Kerberos RFC 1510
105 PH (directory)
106 PASS (change password)
110 POP3 (email) RFC 1081, 1082
113 AUTH RFC 931
119 NNTP (News) RFC 977
123 NTP (Time) RFC 1119
139 NETBIOS Session RFCs 1001, 1002 Windows access (ASIP 6)
143 IMAP (new email) RFC 2060
311 AppleShare Remote Admin ASIP Tech note ASIP 6.1 and later
384 ARNS (tunneling) Univ. of Melbourne
387 AURP (tunneling) RFC 1504
389 LDAP (directory) RFC 1777, 1778
427 SLP (service location) RFC 2165 Only uses TCP for large responses
443 SSL (HTTPS) Draft RFC
497 Retrospect UDP for finding clients
510 FirstClass server SoftArc tech note
515 LPR (printing) RFC 1179
548 AFP (AppleShare) AFP 2.2 spec
554 RTSP (QuickTime server) Apple tech note Also uses UDP 6970+
591 FileMaker Pro Web FileMaker tech note Recommended alternate to 80
626 IMAP Admin Apple extension in ASIP 6
666 Now Contact Server Eudora tech note Violates actual port assignment
687 ASIP Shared U&G Port ASIP Tech note ASIP 6.2 and later
1080 WebSTAR Admin StarNine FAQ WebSTAR port number plus 1000
1417 Timbuktu Control Netopia technote Login is through UDP Port 407
1418 Timbuktu Observe Netopia technote Login is through UDP Port 407
1419 Timbuktu Send Files Netopia technote Login is through UDP Port 407
1420 Timbuktu Exchange Netopia technote Login is through UDP Port 407
1443 WebSTAR/SSL Admin StarNine FAQ WebSTAR port number plus 1000
4000 Now Public Event Server Eudora tech note
4199 EIMS Admin EIMS Users Guide
5003 FileMaker Pro FileMaker tech note Direct access, not through Web; UDP for host list
5190 AOL Instant Messenger AOL tech note
5498 Hotline Tracker Hotline tech note UDP port 5499 for finding servers
5500 Hotline Server Hotline tech note
5501 Hotline Server Hotline tech note
7648 CuSeeMe (video) White pine tech note Client connections; UDP for audio/video
7649 CuSeeMe (video) White pine tech note Connection establishment.
19813 4D server ACI US tech note Previously 14566 (6.0 and earlier)

The complete, official port number list is at http://www.iana.org/assignments/port-numbers , however this list is very difficult to understand, is missing many of the commonly-used (if not official) Macintosh ports and contains a good deal of obsolete information.

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