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// Other services

Port 4131: Global Maintech Stars

Port 4131 is assigned by IANA to stars (Global Maintech Stars).

4131

How stars works

Other services
client:4131starsresponse client:4131starsresponse

The client sends a request to port 4131 and the stars 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 4131 dangerous?

We have no specific security note for port 4131. 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 4131

ServicePortTransportDescriptionReferenceUpdated
stars 4131 TCP, UDP Global Maintech Stars - 2007-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 4131, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4131'      # process listening on 4131
sudo lsof -nP -i :4131

macOS

sudo lsof -nP -i :4131

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4131 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4131
netstat -ano | findstr :4131

From another machine

nmap -p 4131 -sV <host>
sudo nmap -sU -p 4131 <host>
nc -zv <host> 4131

Block it in the firewall

sudo ufw deny 4131/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4131" -Direction Inbound -LocalPort 4131 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4131 used for?

Port 4131 is assigned by IANA to stars (Global Maintech Stars).

Is port 4131 TCP or UDP?

Port 4131 is registered for TCP and UDP.

Is it safe to open port 4131?

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 4131 is open?

On Linux run "ss -ltnup 'sport = :4131'", on macOS "lsof -nP -i :4131", and on Windows "netstat -ano | findstr :4131" to see the local process. From another machine, "nmap -p 4131 <host>" shows whether it is reachable.

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