### TCP
| Protocol | Port Number |
| -------- | ----------- |
| FTP | 21 |
| SSH | 22 |
| Telnet | 23 |
| SMTP | 25 |
| DNS | 53 |
| HTTP | 80 |
| POP3 | 110 |
| NetBIOS | 125 - 139 |
| SMB | 139 + 445 |
| IMAP | 143 |
| LDAP | 389 |
| HTTPS | 443 |
| SMTPS | 465 |
| FTPS | 990 |
| IMAPS | 993 |
| POP3S | 995 |
| RDP | 3389 |
### UDP
| Protocol | Port Number |
| -------- | ----------- |
| DNS | 53 |
| DHCP | 67, 68 |
| TFTP | 69 |
| SNMP | 161 |