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Port 9011 (d-star)

IANA assigns port 9011 to d-star: D-Star Routing digital voice+data for amateur radio.

Registered (user) port, 1024-49151 UDP

Port 9011 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
d-star UDP D-Star Routing digital voice+data for amateur radio QuadNet2 USA IRC Network -

Registry dates for this port: registered 2018-03-16.

Check what is listening on port 9011

Linux: UDP 9011
sudo ss -ulnp 'sport = :9011'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9011
Windows (Command Prompt)
netstat -ano | findstr :9011
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 9011

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9011

Block port 9011 in the firewall

ufw
sudo ufw deny 9011/udp
iptables
sudo iptables -A INPUT -p udp --dport 9011 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9011 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9011' -Direction Inbound -Protocol UDP -LocalPort 9011 -Action Block

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