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Common Port Assignments

Common Port Assignments

Table E-1 lists currently assigned Transmission Control Protocol (TCP) port numbers. To the extent possible, the User Datagram Protocol (UDP) uses the same numbers.


Table E-1: Currently Assigned TCP and UDP Port Numbers
Port Keyword Description

0

-

Reserved

1-4

-

Unassigned

5

RJE

Remote Job Entry

7

ECHO

Echo

9

DISCARD

Discard

11

USERS

Active users

13

DAYTIME

Daytime

15

NETSTAT

Who is up or NETSTAT

17

QUOTE

Quote of the Day

19

CHARGEN

Character Generator

20

FTP-DATA

File Transfer Protocol (data)

21

FTP

File Transfer Protocol

23

TELNET

Terminal connection

25

SMTP

Simple Mail Transport Protocol

37

TIME

Time

39

RLP

Resource Location Protocol

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

75

-

Any private dial-out service

77

-

Any private RJE service

79

FINGER

Finger

95

SUPDUP

SUPDUP Protocol

101

HOST NAME

NIC Host Name Server

102

ISO-TSAP

ISO-TSAP1

103

X400

X400

104

X400-SND

X400-SND

111

SUNRPC

SUN Remote Procedure Call

113

AUTH

Authentication Service

117

UUCP-PATH

UUCP2 Path Service

119

NNTP

Usenet Network News Transfer Protocol

123

NTP

Network Time Protocol

126

SNMP

Simple Network Management Protocol

137

NETBIOS-NS

NETBIOS Name Service

138

NETBIOS-DGM

NETBIOS Datagram Service

139

NETBIOS-SSN

NETBIOS Session Service

161

SNMP

Simple Network Management Protocol Q/R

162

SNMP-TRAP

Simple Network Management Protocol Traps

512

rexec

UNIX rexec (Control)

513

TCP---rlogin
UDP---rwho

TCP---UNIX rlogin
UDP---UNIX Broadcast Name Service

514

TCP---rsh
UDP---syslog

TCP---UNIX rsh and rep
UDP---UNIX System Log

515

Printer

UNIX line printer remote spooling

520

RIP

Routing Information Protocol

525

Timed

Time Server

1TSAP=Transport Service Access Point
2UUCP=UNIX-to-UNIX Copy Protocol


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