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— Appendix D —
Well-Known Port Numbers


Both TCP and UDP use well-known ports, also known as service contact ports. The port names reflect the specific TCP and UDP applications. Ports are the end points of a connection, providing a convenient method for accessing and addressing the connection end.

The following list does not include all TCP and UDP ports, but it does include all those you are likely to encounter. The rest are assigned for historical or experimental reasons.

Port

Name

Description

1

TCPMUX

TCP Port Service Multiplexer

5

RJE

Remote Job Entry

7

ECHO

Echo

9

DISCARD

Discard

11

USERS

Active Users

13

DAYTIME

Daytime

17

Quote

Quote of the Day

19

CHARGEN

Character Generator

20

FTP-DATA

File Transfer (Data Channel)

21

FTP

File Transfer (Control Channel)

23

TELNET

TELNET

25

SMTP

Simple Mail Transfer

27

NSW-FE

NSW User System FE

29

MSG-ICP

MSG-ICP

31

MSG-AUTH

MSG Authentication

33

DSP

Display Support Protocol

35


Private Printer Server

37

TIME

Time

39

RLP

Resource Location Protocol

41

GRAPHICS

Graphics

42

NAMESERVER

Host Name Server

43

NICNAME

Who Is

49

LOGIN

Login Host Protocol

53

DOMAIN

Domain Name Server

67

BOOTPS

Bootstrap Protocol Server

68

BOOTPC

Bootstrap Protocol Client

69

TFTP

Trivial File Transfer Protocol

79

FINGER

Finger

101

HOSTNAMENIC

Host Name Server

102

ISO-TSAP

ISO TSAP

103

X400

X.400

104

X400SND

X.400 SND

105

CSNET-NSCSNET

Mailbox Name Server

109

POP2

Post Office Protocol v2

110

POP3

Post Office Protocol v3

111

SUNRPC

SUN RPC Portmap

137

NETBIOS-NS

NETBIOS Name Service

138

NETBIOS-DGMNET

BIOS Datagram Service

139

NETBIOS-SSNNET

BIOS Session Service

146

ISO-TP0

ISO TP0

147

ISO-IP

ISO IP

150

SQL-NET

SQL-NET

153

SGMP

SGMP

156

SQLSRV

SQL Service

160

SGMP-TRAP5

SGMP TRAPS

161

SNMP

SNMP

162

SNMPTRAP

SNMPTRAP

163

CMIP-MANAGE

CMIP/TCP Manager

164

CMIP-AGENT

CMIP/TCP Agent

165

XNS-COURIER

Xerox Network

179

BGP

Border Gateway Protocol


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