Primary TCP/IP Port Assignments and Descriptions
| Port | Assigment |
|---|---|
| 20 | FTP File Transfer (Data) |
| 21 | FTP File Transfer (Control) |
| 22 | SSH - Secure Shell |
| 23 | Telnet |
| 25 | SMTP - Simple mail Transfer Protocol |
| 53 | DNS - Domain Name Server |
| 69 | TFTP - Trivial File Transfer (UDP based) |
| 80 | HTTP - Hypertext Text Transfer Protocol |