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Port 8609 (canon-cpp-disc)

IANA assigns port 8609 to canon-cpp-disc: Canon Compact Printer Protocol Discovery.

Registered (user) port, 1024-49151 UDP

Port 8609 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
canon-cpp-disc UDP Canon Compact Printer Protocol Discovery Canon Inc -

Registry dates for this port: registered 2012-06-08, last modified 2012-06-15.

Check what is listening on port 8609

Linux: UDP 8609
sudo ss -ulnp 'sport = :8609'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8609
Windows (Command Prompt)
netstat -ano | findstr :8609
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 8609

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8609

Block port 8609 in the firewall

ufw
sudo ufw deny 8609/udp
iptables
sudo iptables -A INPUT -p udp --dport 8609 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8609 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8609' -Direction Inbound -Protocol UDP -LocalPort 8609 -Action Block

Related ports

8567dof-tunnel8600Consul DNS8610canon-mfnp8611canon-bjnp1

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