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// Other services

Port 6543: lds_distrib

Port 6543 is assigned by IANA to lds-distrib (lds_distrib).

6543

How lds-distrib works

Other services
client:6543lds-distribresponse client:6543lds-distribresponse

The client sends a request to port 6543 and the lds-distrib 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 6543 dangerous?

We have no specific security note for port 6543. 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 6543

ServicePortTransportDescriptionReferenceUpdated
lds-distrib 6543 TCP, UDP lds_distrib - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 6543, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6543'      # process listening on 6543
sudo lsof -nP -i :6543

macOS

sudo lsof -nP -i :6543

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6543 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6543
netstat -ano | findstr :6543

From another machine

nmap -p 6543 -sV <host>
sudo nmap -sU -p 6543 <host>
nc -zv <host> 6543

Block it in the firewall

sudo ufw deny 6543/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6543" -Direction Inbound -LocalPort 6543 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6543 used for?

Port 6543 is assigned by IANA to lds-distrib (lds_distrib).

Is port 6543 TCP or UDP?

Port 6543 is registered for TCP and UDP.

Is it safe to open port 6543?

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 6543 is open?

On Linux run "ss -ltnup 'sport = :6543'", on macOS "lsof -nP -i :6543", and on Windows "netstat -ano | findstr :6543" to see the local process. From another machine, "nmap -p 6543 <host>" shows whether it is reachable.

05 Related
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