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Port 47809 (presonus-ucnet)

IANA assigns port 47809 to presonus-ucnet: PreSonus Universal Control Network Protocol.

Registered (user) port, 1024-49151 UDP

Port 47809 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
presonus-ucnet UDP PreSonus Universal Control Network Protocol PreSonus Audio Electronics Inc -

Registry dates for this port: registered 2013-07-12.

Check what is listening on port 47809

Linux: UDP 47809
sudo ss -ulnp 'sport = :47809'
Linux / macOS: which process owns the port
sudo lsof -nP -i :47809
Windows (Command Prompt)
netstat -ano | findstr :47809
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 47809

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 47809

Block port 47809 in the firewall

ufw
sudo ufw deny 47809/udp
iptables
sudo iptables -A INPUT -p udp --dport 47809 -j DROP
nftables
sudo nft add rule inet filter input udp dport 47809 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 47809' -Direction Inbound -Protocol UDP -LocalPort 47809 -Action Block

Related ports

47806ap47808BACnet/IP48000nimcontroller48001nimspooler

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