Apple Remote Desktop 3.1 - Manual (Page 170)

170 Appendix A Icon and Port Reference
TCP and UDP Port Reference
Apple Remote Desktop uses the following TCP and UDP ports for the functions
indicated.
Over 95% used
No status information is available
Service Icon Status
Port Protocol Function
5900 TCP Observe and Control
5900 UDP Send screen, share screen
3283 TCP Reporting
3283 UDP Everything else
22 TCP Encrypted file transfer, observe,
and control (via SSH tunnel)