# WHATPORT(5906)

## NAME

port 5906 — rpas-c2 (ICAO) / VNC display :6 in practice — Registered for remotely piloted aircraft command and control; in practice, VNC display :6.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigns 5906 to rpas-c2, "Remotely Piloted Vehicle C&C", registered by ICAO for the command-and-control link of remotely piloted aircraft systems. That is aviation infrastructure on private networks, not something a scanner meets. On an ordinary server, 5906 is the RFB port for display :6, typically the sixth VM console on a busy KVM or Proxmox host.

## EXPOSURE

**Do not expose.** Whichever it is, it is a control plane — a guest's console or an aircraft C2 link. Neither belongs on a public interface.

## CHECK

```sh
nc -w 3 TARGET 5906 | head -c 12; echo
```

## SEE ALSO

- iana — [IANA port registry — 5906 (rpas-c2)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5906) (iana.org)
- spec — [RFC 6143 — The Remote Framebuffer Protocol](https://datatracker.ietf.org/doc/html/rfc6143) (datatracker.ietf.org)

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HTML: <https://whatport.net/5906/> · JSON: <https://whatport.net/5906.json> · full dataset: <https://whatport.net/ports.json>