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Port 8384 (marathontp)

IANA assigns port 8384 to marathontp: Marathon Transport Protocol.

Registered (user) port, 1024-49151 UDP

Port 8384 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
marathontp UDP Marathon Transport Protocol Inertia Systemes -

Registry dates for this port: registered 2015-06-11.

Check what is listening on port 8384

Linux: UDP 8384
sudo ss -ulnp 'sport = :8384'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8384
Windows (Command Prompt)
netstat -ano | findstr :8384
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 8384

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8384

Block port 8384 in the firewall

ufw
sudo ufw deny 8384/udp
iptables
sudo iptables -A INPUT -p udp --dport 8384 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8384 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8384' -Direction Inbound -Protocol UDP -LocalPort 8384 -Action Block

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