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# System prepended metadata

title: Ports

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# Ports

| Protocol | Port number | Transport Layer |
| -------- | -------- | -------- |
| DNS | 53 | UDP |
| DHCP |68  | UDP
| HTTP | 80 | TCP |
| HTTPS | 443 | TCP |
| SMTP | 25 | TCP |
| POP3 | 110 | TCP | 
| IMAP4 | 143  | TCP |
| FTP |20/21| TCP  | 
| TFTP | 69 | UDP | 
| TELNET |23  | TCP |
| SSH | 22 | TCP|
| SNMP | 161  | UDP |
| SIP |  |
| SSH | 22| TCP |
| HTTP | 80 | TCP |
| HTTPS | 443 | TCP |