Cisco CISCO776 Installation Guide - Page 85

Table A-5, Currently Assigned TCP and UDP Port Numbers, Keyword, Description

Page 85 highlights

Table A-5 Currently Assigned TCP and UDP Port Numbers Port Keyword 0 - 1-4 - 5 RJE 7 ECHO 9 DISCARD 11 USERS 13 DAYTIME 15 NETSTAT 17 QUOTE 19 CHARGEN 20 FTP-DATA 21 FTP 23 TELNET 25 SMTP 37 TIME 39 RLP 42 NAMESERVER 43 NICNAME 49 LOGIN 53 DOMAIN 67 BOOTPS 68 BOOTPC 69 TFTP 75 - 77 - 79 FINGER Description Reserved Unassigned Remote Job Entry Echo Discard Active users Daytime Who is up or NETSTAT Quote of the Day Character Generator File Transfer Protocol (data) File Transfer Protocol Terminal connection Simple Mail Transport Protocol Time Resource Location Protocol Host Name Server Who is Login Host Protocol Domain Name Service Bootstrap Protocol Server Bootstrap Protocol Client Trivial File Transfer Protocol Any private dial-out service Any private RJE service Finger Specifications A-5

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Specifications
A-5
Table A-5
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 Service
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