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 |
| 110 | POP3 - Post Office Protocol |
| 119 | NNTP - Network News Transfer Protocol |
| 123 | NTP - Network Time Protocol |
| 143 | IMAP4 - Internet Message Access Protocol, Version 4 |
| 161 | SNMP - Simple Network Management Protocol |
| 443 | HTTPS - Hypertext Transfer Protocol Secure |