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// Other services

Port 4883: Meier-Phelps License Server

Port 4883 is assigned by IANA to wmlserver (Meier-Phelps License Server).

4883

How wmlserver works

Other services
client:4883wmlserverresponse client:4883wmlserverresponse

The client sends a request to port 4883 and the wmlserver service answers.

Transport
TCP
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 4883 dangerous?

We have no specific security note for port 4883. 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 4883

ServicePortTransportDescriptionReferenceUpdated
wmlserver 4883 TCP Meier-Phelps License Server - 2010-03-22
-4883-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4883, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4883'      # process listening on 4883
sudo lsof -nP -i :4883

macOS

sudo lsof -nP -i :4883

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4883 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4883
netstat -ano | findstr :4883

From another machine

nmap -p 4883 -sV <host>
nc -zv <host> 4883

Block it in the firewall

sudo ufw deny 4883/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4883" -Direction Inbound -LocalPort 4883 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4883 used for?

Port 4883 is assigned by IANA to wmlserver (Meier-Phelps License Server).

Is port 4883 TCP or UDP?

Port 4883 is registered for TCP.

Is it safe to open port 4883?

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 4883 is open?

On Linux run "ss -ltnup 'sport = :4883'", on macOS "lsof -nP -i :4883", and on Windows "netstat -ano | findstr :4883" to see the local process. From another machine, "nmap -p 4883 <host>" shows whether it is reachable.

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