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// Other services

Port 4741: Luminizer Manager

Port 4741 is assigned by IANA to lumimgrd (Luminizer Manager).

4741

How lumimgrd works

Other services
client:4741lumimgrdresponse client:4741lumimgrdresponse

The client sends a request to port 4741 and the lumimgrd 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 4741 dangerous?

We have no specific security note for port 4741. 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 4741

ServicePortTransportDescriptionReferenceUpdated
lumimgrd 4741 TCP, UDP Luminizer Manager - 2007-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4741, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4741'      # process listening on 4741
sudo lsof -nP -i :4741

macOS

sudo lsof -nP -i :4741

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4741 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4741
netstat -ano | findstr :4741

From another machine

nmap -p 4741 -sV <host>
sudo nmap -sU -p 4741 <host>
nc -zv <host> 4741

Block it in the firewall

sudo ufw deny 4741/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4741" -Direction Inbound -LocalPort 4741 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4741 used for?

Port 4741 is assigned by IANA to lumimgrd (Luminizer Manager).

Is port 4741 TCP or UDP?

Port 4741 is registered for TCP and UDP.

Is it safe to open port 4741?

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 4741 is open?

On Linux run "ss -ltnup 'sport = :4741'", on macOS "lsof -nP -i :4741", and on Windows "netstat -ano | findstr :4741" to see the local process. From another machine, "nmap -p 4741 <host>" shows whether it is reachable.

05 Related
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