PORT ASSIGNMENTS
Computers communicating with each other use port numbers to select different applications. On the destination computer running the application the ports are assigned as follows:-
- Well Known Ports - from 0 through 1023
- Registered Ports - from 1024 through 49151
- Dynamic and/or Private Ports - from 49152 through 65535
The source computer, requesting the application, dynamically assigns its own port numbers usually using numbers greater than 1023.
The Well Known Ports, in the range of 0-1023, are considered public port numbers and are controlled by the Internet Assigned Numbers Authority (IANA). The table in the next section lists the port numbers for some of the most common applications.
Common Well-Known Port Numbers
|
| Port Number
| Assignment
| Explanation
|
| 20 |
FTP - Data |
File Transfer Protocol |
| 21 |
FTP - Control |
File Transfer Protocol |
| 22 |
SSH |
Secure Shell |
| 23 |
Telnet |
Terminal emulation protocol |
| 25 |
SMTP |
Simple Mail Transfer Protocol |
| 42 |
DNS |
Name Servers |
| 53 |
DNS |
Domain Name Protocol |
| 69 |
TFTP |
Trivial File Transfer Protocol |
| 80 |
HTTP |
Hypertext Transfer Protocol, Web pages |
| 110 |
POP3 |
Post Office Protocol |
| 161 |
SNMP |
Simple Network Management Protocol |
| 443 |
HTTPS |
Secure HTTP, secure Web pages |
| 520 |
RIP |
Routing Information Protocol |
| 6667 |
IRC |
Internet Relay Chat |
|
For further information see Port Numbers assigned by IANA
RFC 1700.
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(c) Compiled by B V Wood.
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