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// Other services

Port 4378: Cambridge Pixel SPx Display

Port 4378 is assigned by IANA to cp-spxdpy (Cambridge Pixel SPx Display).

4378

How cp-spxdpy works

Other services
client:4378cp-spxdpyresponse client:4378cp-spxdpyresponse

The client sends a request to port 4378 and the cp-spxdpy 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 4378 dangerous?

We have no specific security note for port 4378. 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 4378

ServicePortTransportDescriptionReferenceUpdated
cp-spxdpy 4378 TCP, UDP Cambridge Pixel SPx Display - 2007-07-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 4378, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4378'      # process listening on 4378
sudo lsof -nP -i :4378

macOS

sudo lsof -nP -i :4378

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4378 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4378
netstat -ano | findstr :4378

From another machine

nmap -p 4378 -sV <host>
sudo nmap -sU -p 4378 <host>
nc -zv <host> 4378

Block it in the firewall

sudo ufw deny 4378/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4378" -Direction Inbound -LocalPort 4378 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4378 used for?

Port 4378 is assigned by IANA to cp-spxdpy (Cambridge Pixel SPx Display).

Is port 4378 TCP or UDP?

Port 4378 is registered for TCP and UDP.

Is it safe to open port 4378?

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 4378 is open?

On Linux run "ss -ltnup 'sport = :4378'", on macOS "lsof -nP -i :4378", and on Windows "netstat -ano | findstr :4378" to see the local process. From another machine, "nmap -p 4378 <host>" shows whether it is reachable.

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