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Port 5794 (spdp)

IANA assigns port 5794 to spdp: Simple Peered Discovery Protocol.

Registered (user) port, 1024-49151 UDP

Port 5794 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
spdp UDP Simple Peered Discovery Protocol Dave Lindquist -

Registry dates for this port: registered 2010-05-27.

Check what is listening on port 5794

Linux: UDP 5794
sudo ss -ulnp 'sport = :5794'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5794
Windows (Command Prompt)
netstat -ano | findstr :5794
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 5794

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5794

Block port 5794 in the firewall

ufw
sudo ufw deny 5794/udp
iptables
sudo iptables -A INPUT -p udp --dport 5794 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5794 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5794' -Direction Inbound -Protocol UDP -LocalPort 5794 -Action Block

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5787waascluster5793xtreamx5798enlabel-dpl5813icmpd

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.