| Protocol name | Default port number |
|---|---|
| HTTP | 80 |
| HTTPS | 443 |
| FTP | 21 |
| SSH | 22 |
| Telnet | 23 |
| SMTP | 25 |
| DNS | 53 |
| DHCP | 67/68 |
| SNMP | 161/162 |
| NTP | 123 |
| LDAP | 389 |
| SMB/CIFS | 445 |
| RDP | 3389 |
| MySQL | 3306 |
| PostgreSQL | 5432 |
The above is a list of some common protocols and their default port numbers for reference.