The following table is a list of Common Ports that are used in most major and their associated common uses.
| Port | Protocol | Common Usage |
|---|
| 20 | TCP | FTP |
| 21 | TCP | FTP |
| 22 | TCP | SSH |
| 23 | TCP | Telnet |
| 25 | TCP | SMTP |
| 26 | TCP | SMTP (Alternate) |
| 53 | TCP & UDP | DNS |
| 67 | UDP | DHCP |
| 68 | UDP | DHCP |
| 80 | TCP | HTTP |
| 110 | TCP | POP3 |
| 123 | TCP | NTP |
| 143 | TCP | IMAP |
| 443 | TCP | HTTPS (HTTP over SSL) |
| 465 | TCP | SMTP (over SSL) |
| 567 | TCP | SMTP |
| 993 | TCP | IMAPS |
| 995 | TCP | POP3S |
| 1220 | TCP | QuickTime Steaming |
| 3389 | TCP | RDP |
| 8080 | TCP | Common HTTP(S) Alternative |
Application Specific Ports
The following table lists any a that are commonly used.
Where multiple ports are available, a s port should be used over a standard (unencrypted port).
| Port | Protocol | Common Usage |
|---|
| 1433 | TCP | MS SQL Server |
| 2077 | TCP | WHM WebDAV |
| 2078 | TCP | WHM WebDAV (Secure) |
| 2082 | TCP | cPanel |
| 2083 | TCP | cPanel (Secure) |
| 2086 | TCP | WHM |
| 2087 | TCP | WHM (Secure) |
| 2095 | TCP | Web Mail |
| 2096 | TCP | Web Mail (Secure) |
| 3306 | TCP | MySQL |
| 5666 | TCP | Memset Monitoring Client (Nagios / NRPE) |
| 12121 | TCP | Webmin |