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CompTIA
CompTIA N10-007 Exam
Common port numbers
There are hundreds of hundreds of ports associated with specific protocols. You only need to know most common handful of ports.
| Protocol | General Port | Secure Port | TCP/UDP |
|---|---|---|---|
| FTP | 21 | 989/990 | TCP |
| SSH | 22 | 22 | TCP/UDP |
| Telnet | 23 | NA | TCP/UDP |
| SMTP | 25 | 587 or 465 | TCP |
| DNS | 53 | NA | TCP/UDP |
| TFTP | 69 | NA | UDP |
| DHCP | server 87 clinet 68 |
NA | TCP/UDP |
| HTTP | 80 | 443 | TCP |
| POP3 | 110 | 995 | TCP |
| NTP | 123 | NA | UDP |
| NetBIOS | 143 | 993 | TCP |
| SNMP | 161 | NA | UDP |
| SNMPTRAP | 162 | NA | TCP/UDP |
| SLP | 427 | NA | TCP/UDP |
| AFP | 548 | NA | TCP |
| H.323 | 1720 | NA | TCP | RDP | 3389 | NA | TCP/UDP |
| SIP | 5060 | 5061 | TCP/UDP |
OSI model image credits: Building Automation Monthly