A P P E N D I X D

Common Port Assignments

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

 

 

Table D-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

 

Hostname 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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco 819 Integrated Services Routers Software Configuration Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OL-18906-02

 

 

 

 

 

 

D-1

 

 

 

 

 

 

 

 

 

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Cisco Systems C819HG4GVK9, C819GUK9 manual Common Port Assignments, Port Keyword Description