CyberHunter
Local dataset, no network
// Other services

Port 3591: LOCANIS G-TRACK Server

Port 3591 is assigned by IANA to gtrack-server (LOCANIS G-TRACK Server).

3591

How gtrack-server works

Other services
client:3591gtrack-serverresponse client:3591gtrack-serverresponse

The client sends a request to port 3591 and the gtrack-server 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 3591 dangerous?

We have no specific security note for port 3591. 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 3591

ServicePortTransportDescriptionReferenceUpdated
gtrack-server 3591 TCP, UDP LOCANIS G-TRACK Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3591, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3591'      # process listening on 3591
sudo lsof -nP -i :3591

macOS

sudo lsof -nP -i :3591

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3591 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3591
netstat -ano | findstr :3591

From another machine

nmap -p 3591 -sV <host>
sudo nmap -sU -p 3591 <host>
nc -zv <host> 3591

Block it in the firewall

sudo ufw deny 3591/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3591" -Direction Inbound -LocalPort 3591 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3591 used for?

Port 3591 is assigned by IANA to gtrack-server (LOCANIS G-TRACK Server).

Is port 3591 TCP or UDP?

Port 3591 is registered for TCP and UDP.

Is it safe to open port 3591?

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 3591 is open?

On Linux run "ss -ltnup 'sport = :3591'", on macOS "lsof -nP -i :3591", and on Windows "netstat -ano | findstr :3591" to see the local process. From another machine, "nmap -p 3591 <host>" shows whether it is reachable.

05 Related
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