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Port 8732 (dtp-net)

IANA assigns port 8732 to dtp-net: DASGIP Net Services.

Registered (user) port, 1024-49151 UDP

Port 8732 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
dtp-net UDP DASGIP Net Services Dr Matthias Arnold -

Registry dates for this port: registered 2009-03-23.

Check what is listening on port 8732

Linux: UDP 8732
sudo ss -ulnp 'sport = :8732'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8732
Windows (Command Prompt)
netstat -ano | findstr :8732
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 8732

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8732

Block port 8732 in the firewall

ufw
sudo ufw deny 8732/udp
iptables
sudo iptables -A INPUT -p udp --dport 8732 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8732 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8732' -Direction Inbound -Protocol UDP -LocalPort 8732 -Action Block

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