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// Other services

Port 24666: Service used by SmarDTV to communicate between a CAM and a second screen application

Port 24666 is assigned by IANA to sdtvwcam (Service used by SmarDTV to communicate between a CAM and a second screen application).

24666

How sdtvwcam works

Other services
client:24666sdtvwcamresponse client:24666sdtvwcamresponse

The client sends a request to port 24666 and the sdtvwcam service answers.

Transport
TCP
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 24666 dangerous?

We have no specific security note for port 24666. 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 24666

ServicePortTransportDescriptionReferenceUpdated
sdtvwcam 24666 TCP Service used by SmarDTV to communicate between a CAM and a second screen application - 2015-03-04
-24666-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 24666, and is it reachable?

Linux

sudo ss -ltnup 'sport = :24666'      # process listening on 24666
sudo lsof -nP -i :24666

macOS

sudo lsof -nP -i :24666

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 24666 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 24666
netstat -ano | findstr :24666

From another machine

nmap -p 24666 -sV <host>
nc -zv <host> 24666

Block it in the firewall

sudo ufw deny 24666/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 24666" -Direction Inbound -LocalPort 24666 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 24666 used for?

Port 24666 is assigned by IANA to sdtvwcam (Service used by SmarDTV to communicate between a CAM and a second screen application).

Is port 24666 TCP or UDP?

Port 24666 is registered for TCP.

Is it safe to open port 24666?

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 24666 is open?

On Linux run "ss -ltnup 'sport = :24666'", on macOS "lsof -nP -i :24666", and on Windows "netstat -ano | findstr :24666" to see the local process. From another machine, "nmap -p 24666 <host>" shows whether it is reachable.

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