| FTP (File Transfer Protocol, file transfer protocol) |
21 port |
| SSH (Secure Shell Protocol, Secure Shell Protocol) |
22 ports |
| Telnet (Remote Terminal Protocol) |
23 ports |
| STMP (Simple Mail Transfer Protocol, Simple Mail Transfer Protocol) |
25 ports |
| DNS (Domain Name System, domain name system) |
port 53 |
| HTTP (Hyper Text Transfer Protocol, Hypertext Transfer Protocol) |
port 80 |
| POP3 (Post Office Protocol - Version 3, Post Office Protocol Version 3) |
port 110 |
| RPC (Remote Procedure Call, remote procedure call) |
port 135 |
| SMB (Samba, for sharing files, printers, serial ports, etc.) |
139/445 ports |
| HTTPS (Hyper Text Transfer Protocol over SecureSocket Layer, Hypertext Transfer Security Protocol) |
port 443 |
| Microsoft SQL Server database |
port 1433 |
| Oracle database |
port 1521 |
| Mysql database |
port 3306 |
| RDP (Remote Desktop Protocol Remote Desktop Services) |
port 3389 |