# Port Numbers

| TCP                                                                                                                                                                      | UDP                                                                                                                                                    | TCP & UDP                  |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------- |
| <ul><li>20 - FTP data</li><li>21 - FTP control</li><li>22 - SSH</li><li>23 - Telnet</li><li>25 - SMTP</li><li>80 - HTTP</li><li>110 - POP3</li><li>443 - HTTPS</li></ul> | <ul><li>67 - DHCP server</li><li>68 - DHCP client</li><li>69 - TFTP</li><li>161 - SNMP agent</li><li>162 - SNMP manager</li><li>514 - Syslog</li></ul> | <ul><li>53 - DNS</li></ul> |