In this article you will find some commonly used and good to know ports.
0 – 1023 – Well Known Port Numbers
1024 – 49151 – Registered Port numbers
49152 – 65535 – Dynamically Assigned Port Numbers
| Protocol | Port number |
| File Transfer Protocol (FTP) Data Transfer | 20 |
| File Transfer Protocol (FTP) Command Control | 21 |
| Secure File Transfer Protocol (SFTP) | 22 |
| Secure Shell (SSH) | 22 |
| Telnet – Remote login service, unencrypted text message | 23 |
| Simple Mail Transfer Protocol (SMTP) | 25 |
| Domain Name System service (DNS) | 53 |
| Dynamic Host Configuration Protocol | 67, 68 |
| Trivial File Transfer Protocol (TFTP) | 69 |
| Hypertext Transfer Protocol (HTTP) | 80 |
| Post Office Protocol (POP3) | 110 |
| Network News Transfer Protocol (NNTP) |
119 |
| Network Time Protocol (NTP) | 123 |
| Internet Message Access Protocol (IMAP) | 143 |
| Simple Network Management Protocol (SNMP) |
161, 162 |
| Lightweight Directory Access Protocol (LDAP) | 389 |
| HTTP Secure (HTTPS) HTTP over TLS/SSL | 443 |
| Real Time Sreaming Protocol (RTSP) | 554 |
| Simple Mail Transfer Protocol (SMTP) over TLS/SSL |
465 |
| Internet Message Access Protocol (IMAP) over TLS/SSL |
993 |
| Post Office Protocol (POP3) over TLS/SSL | 995 |
| Remote Desktop Protocol (RDP) |
3389 |