Appendix B, TCP Port Numbers

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4D Internet Commands v16

0 to 1023 (Well Known Ports): The Well Known Ports are assigned by the I.A.N.A. (Internet Assigned Numbers Authority) and on most systems can only be used by system (or root) processes or by programs executed by privileged users.
- 20 and 21 FTP;
- 23 TELNET;
- 25 SMTP;
- 37 NTP;
- 80 and 8080 HTTP;
- 443 HTTPS.
1024 to 49151 (Registered Ports): The Registered Ports are listed by the I.A.N.A. and on most systems can be used by ordinary user processes or programs executed by ordinary users (routers, specific applications...)
49152 to 65535 (Dynamic and/or Private Ports) : The Dynamic and/or Private Ports are free of use.

People who want to use TCP/IP commands to synchronize databases would have to use port numbers higher than 49151.

For more information, please visit the I.A.N.A. Web site: http://www.iana.org

daytime	13	Daytime
qotd	17	Quote of the Day
ftp-data	20	File Transfer [Default Data]
ftp	21	File Transfer [Control]
telnet	23	Telnet
smtp	25	Simple Mail Transfer
time	37	Time
nicname	43	Who Is
domain	53	Domain Name Server
sql*net	66	Oracle SQL*NET
gopher	70	Gopher
finger	79	Finger
http	80	World Wide Web HTTP
poppassd	106	Password Server
rtelnet	107	Remote Telnet Service
pop2	109	Post Office Protocol - Version 2
pop3	110	Post Office Protocol - Version 3
sunrpc	111	SUN Remote Procedure Call
auth	113	Authentication Service
sftp	115	Simple File Transfer Protocol
sqlserv	118	SQL Services
nntp	119	Network News Transfer Protocol
ntp	123	Network Time Protocol
pwdgen	129	Password Generator Protocol
imap2	143	Interactive Mail Access Protocol v2
news	144	NewS
sql-net	150	SQL-NET
multiplex	171	Network Innovations Multiplex
cl/1	172	Network Innovations CL/1
at-rtmp	201	AppleTalk Routing Maintenance
at-nbp	202	AppleTalk Name Binding
at-3	203	AppleTalk Unused
at-echo	204	AppleTalk Echo
at-5	205	AppleTalk Unused
at-zis	206	AppleTalk Zone Information
at-7	207	AppleTalk Unused
at-8	208	AppleTalk Unused
ipx	213	IPX
netware-ip	396	Novell Netware over IP
timbuktu	407	Timbuktu
https	443	Secured protocol
conference	531	chat
netnews	532	readnews
netwall	533	for emergency broadcasts
uucp	540	uucpd
uucp-rlogin	541	uucp-rlogin
whoami	565	whoami
ipcserver	600	Sun IPC server
phonebook	767	phone
accessbuilder	888	AccessBuilder