Nortel Networks NB5PLUS4/W User Manual

from 0 to 65535, but only ports numbers 0 to 1023 are reserved for privileged serv-

ices and are designated as “well-known ports”. The registered ports are numbered 

from 1024 through 49151. The remaining ports, referred to as dynamic ports or 

private ports, are numbered from 49152 through 65535. 

Examples of well-known and registered port numbers are shown in Table 4, for fur-

ther information, please see IANA’s website at: http://www.iana.org/assignments/

port-numbers 

Well-know and registered Ports 

Port Number  

Protocol  

Description 

 20  

TCP  

FTP Data 

 21  

TCP 

FTP Control 

 22  

TCP & UDP  

SSH Remote Login Protocol 

 23  

TCP  

Telnet 

 25  

TCP  

SMTP (Simple Mail Transfer Protocol) 

 53  

TCP & UDP  

DNS (Domain Name Server) 

 69  

UDP  

TFTP (Trivial File Transfer Protocol) 

 80  

TCP  

World Wide Web HTTP 

110 

TCP  

POP3 (Post Office Protocol Version 3) 

119  

TCP  

NEWS (Network News Transfer Protocol) 

123  

UDP  

NTP (Network Time Protocol) 

443  

TCP & UDP  

HTTPS 

1503  

TCP  

T.120 

1720  

TCP  

H.323 

4000  

TCP  

ICQ 

7070  

UDP  

RealAudio 

Easy Port Forwarding: Applying Pre-Defined Rules

Available pre-defined rules are categorised according to the application type.  Click 

the Radio Button adjacent to the appropriate Category, and then select the required 

application name. Click on the Add button to move the application into the Applied 

Rules box. In the example shown on the previous page, ‘Delta Force’ has been se-

lected from the list of Available Rules and is about to be copied to Applied Rules.  In 

the example, this will configure your Modem ports to use with ‘Delta Force’ .