| Protocol/service name | The port number | Introduction to the |
|---|---|---|
| ftp | 20 and 21 | File Transfer Protocol Indicates the File Transfer Protocol, 20 for connection and 21 for transmission |
| ssh | 22 | Secure Shell A protocol that provides security for remote login sessions and other network services |
| telnet | 23 | Unsafe text transfer |
| smtp | 25 | Simple Mail Transfer Protocol Simple Mail Transfer Protocol |
| DNS | 53 | Domain Name System Domain Name resolution |
| DHCP | 67/68 | Dynamic IP protocol |
| http | 80 | Hyper Text Transfer Protocol Hyper Text Transfer Protocol for Web browsing |
| https | 443 | Hypertext Transfer Protocol Secure Is used for Secure Web browsing |
| The Shared file | 445 | The ability to secretly share your hard drive through this port, and even format it without anyone noticing |
| pop3 | 110 | Post Office Protocol |
| Remote Desktop Port | 3389 | Can connect to your computer remotely and do bad things |
| WWW proxy service | 8080 | Apache Tomcat Web Server for Web browsing |