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// Other services

Port 4302: Diagnostic Data Control

Port 4302 is assigned by IANA to d-data-control (Diagnostic Data Control).

4302

How d-data-control works

Other services
client:4302d-data-controlresponse client:4302d-data-controlresponse

The client sends a request to port 4302 and the d-data-control 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 4302 dangerous?

We have no specific security note for port 4302. 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 4302

ServicePortTransportDescriptionReferenceUpdated
d-data-control 4302 TCP, UDP Diagnostic Data Control - 2006-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 4302, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4302'      # process listening on 4302
sudo lsof -nP -i :4302

macOS

sudo lsof -nP -i :4302

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4302 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4302
netstat -ano | findstr :4302

From another machine

nmap -p 4302 -sV <host>
sudo nmap -sU -p 4302 <host>
nc -zv <host> 4302

Block it in the firewall

sudo ufw deny 4302/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4302" -Direction Inbound -LocalPort 4302 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4302 used for?

Port 4302 is assigned by IANA to d-data-control (Diagnostic Data Control).

Is port 4302 TCP or UDP?

Port 4302 is registered for TCP and UDP.

Is it safe to open port 4302?

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 4302 is open?

On Linux run "ss -ltnup 'sport = :4302'", on macOS "lsof -nP -i :4302", and on Windows "netstat -ano | findstr :4302" to see the local process. From another machine, "nmap -p 4302 <host>" shows whether it is reachable.

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