TurboVNC primarily uses port 5900 by default for its VNC server. However, it can also use a range of ports depending on the configuration:

• Default port: 5900 (for the first display, e.g., :0).
• Additional displays: If multiple displays are configured, TurboVNC uses ports like 5901 (:1), 5902 (:2), and so on.

TurboVNC also supports SSH tunneling for secure connections, which typically uses port 22.