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// Other services

Port 4877: Lighting Management Control System

Port 4877 is assigned by IANA to lmcs (Lighting Management Control System).

4877

How lmcs works

Other services
client:4877lmcsresponse client:4877lmcsresponse

The client sends a request to port 4877 and the lmcs 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 4877 dangerous?

We have no specific security note for port 4877. 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 4877

ServicePortTransportDescriptionReferenceUpdated
lmcs 4877 TCP, UDP Lighting Management Control System - 2011-02-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 4877, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4877'      # process listening on 4877
sudo lsof -nP -i :4877

macOS

sudo lsof -nP -i :4877

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4877 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4877
netstat -ano | findstr :4877

From another machine

nmap -p 4877 -sV <host>
sudo nmap -sU -p 4877 <host>
nc -zv <host> 4877

Block it in the firewall

sudo ufw deny 4877/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4877" -Direction Inbound -LocalPort 4877 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4877 used for?

Port 4877 is assigned by IANA to lmcs (Lighting Management Control System).

Is port 4877 TCP or UDP?

Port 4877 is registered for TCP and UDP.

Is it safe to open port 4877?

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 4877 is open?

On Linux run "ss -ltnup 'sport = :4877'", on macOS "lsof -nP -i :4877", and on Windows "netstat -ano | findstr :4877" to see the local process. From another machine, "nmap -p 4877 <host>" shows whether it is reachable.

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