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Port 4534 (armagetronad)

IANA assigns port 4534 to armagetronad: Armagetron Advanced Game Server.

Registered (user) port, 1024-49151 UDP

Port 4534 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
armagetronad UDP Armagetron Advanced Game Server Manuel Moos -

Registry dates for this port: registered 2012-11-02.

Check what is listening on port 4534

Linux: UDP 4534
sudo ss -ulnp 'sport = :4534'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4534
Windows (Command Prompt)
netstat -ano | findstr :4534
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 4534

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4534

Block port 4534 in the firewall

ufw
sudo ufw deny 4534/udp
iptables
sudo iptables -A INPUT -p udp --dport 4534 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4534' -Direction Inbound -Protocol UDP -LocalPort 4534 -Action Block

Related ports

4502a25-fap-fgw4503m-bus-oms4535ehs4536ehs-ssl

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