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// Other services

Port 5906: Remotely Piloted Vehicle C&C

Port 5906 is assigned by IANA to rpas-c2 (Remotely Piloted Vehicle C&C).

5906

How rpas-c2 works

Other services
client:5906rpas-c2response client:5906rpas-c2response

The client sends a request to port 5906 and the rpas-c2 service answers.

Transport
TCP · UDP · SCTP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 5906 dangerous?

We have no specific security note for port 5906. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 5906

ServicePortTransportDescriptionReferenceUpdated
rpas-c2 5906 TCP, UDP, SCTP Remotely Piloted Vehicle C&C - 2022-06-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 5906, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5906'      # process listening on 5906
sudo lsof -nP -i :5906

macOS

sudo lsof -nP -i :5906

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5906 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5906
netstat -ano | findstr :5906

From another machine

nmap -p 5906 -sV <host>
sudo nmap -sU -p 5906 <host>
nc -zv <host> 5906

Block it in the firewall

sudo ufw deny 5906/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5906" -Direction Inbound -LocalPort 5906 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5906 used for?

Port 5906 is assigned by IANA to rpas-c2 (Remotely Piloted Vehicle C&C).

Is port 5906 TCP or UDP?

Port 5906 is registered for TCP and UDP and SCTP.

Is it safe to open port 5906?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 5906 is open?

On Linux run "ss -ltnup 'sport = :5906'", on macOS "lsof -nP -i :5906", and on Windows "netstat -ano | findstr :5906" to see the local process. From another machine, "nmap -p 5906 <host>" shows whether it is reachable.

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