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Port 3591 (gtrack-server)

IANA assigns port 3591 to gtrack-server: LOCANIS G-TRACK Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gtrack-server TCP LOCANIS G-TRACK Server - -
gtrack-server UDP LOCANIS G-TRACK Server - -

Check what is listening on port 3591

Linux: is anything listening on TCP 3591?
sudo ss -tlnp 'sport = :3591'
Linux: UDP 3591
sudo ss -ulnp 'sport = :3591'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3591
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3591 '
Windows (Command Prompt)
netstat -ano | findstr :3591
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3591 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3591
From Windows
Test-NetConnection HOST -Port 3591
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3591

Block port 3591 in the firewall

ufw
sudo ufw deny 3591/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3591 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3591 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3591' -Direction Inbound -Protocol TCP -LocalPort 3591 -Action Block
ufw
sudo ufw deny 3591/udp
iptables
sudo iptables -A INPUT -p udp --dport 3591 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3591 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3591' -Direction Inbound -Protocol UDP -LocalPort 3591 -Action Block

Related ports

3589isomair3590wv-csp-sms3592gtrack-ne3593bpmd

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.