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// Other services

Port 9668: tec5 Spectral Device Control Protocol

Port 9668 is assigned by IANA to tec5-sdctp (tec5 Spectral Device Control Protocol).

9668

How tec5-sdctp works

Other services
client:9668tec5-sdctpresponse client:9668tec5-sdctpresponse

The client sends a request to port 9668 and the tec5-sdctp service answers.

Transport
TCP · UDP
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 9668 dangerous?

We have no specific security note for port 9668. 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 9668

ServicePortTransportDescriptionReferenceUpdated
tec5-sdctp 9668 TCP, UDP tec5 Spectral Device Control Protocol - 2009-05-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 9668, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9668'      # process listening on 9668
sudo lsof -nP -i :9668

macOS

sudo lsof -nP -i :9668

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9668 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9668
netstat -ano | findstr :9668

From another machine

nmap -p 9668 -sV <host>
sudo nmap -sU -p 9668 <host>
nc -zv <host> 9668

Block it in the firewall

sudo ufw deny 9668/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9668" -Direction Inbound -LocalPort 9668 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9668 used for?

Port 9668 is assigned by IANA to tec5-sdctp (tec5 Spectral Device Control Protocol).

Is port 9668 TCP or UDP?

Port 9668 is registered for TCP and UDP.

Is it safe to open port 9668?

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 9668 is open?

On Linux run "ss -ltnup 'sport = :9668'", on macOS "lsof -nP -i :9668", and on Windows "netstat -ano | findstr :9668" to see the local process. From another machine, "nmap -p 9668 <host>" shows whether it is reachable.

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