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// Network services

Port 8609: Canon Compact Printer Protocol Discovery

Port 8609 is assigned by IANA to canon-cpp-disc (Canon Compact Printer Protocol Discovery).

8609

How canon-cpp-disc works

Network services
client:8609canon-cpp-discresponse client:8609canon-cpp-discresponse

The client sends a request to port 8609 and the canon-cpp-disc service answers.

Transport
UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 8609 dangerous?

We have no specific security note for port 8609. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 8609

ServicePortTransportDescriptionReferenceUpdated
canon-cpp-disc 8609 UDP Canon Compact Printer Protocol Discovery - 2012-06-15
-8609-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8609, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8609'      # process listening on 8609
sudo lsof -nP -i :8609

macOS

sudo lsof -nP -i :8609

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8609 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8609
netstat -ano | findstr :8609

From another machine

nmap -p 8609 -sV <host>
sudo nmap -sU -p 8609 <host>
nc -zv <host> 8609

Block it in the firewall

sudo ufw deny 8609/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8609" -Direction Inbound -LocalPort 8609 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8609 used for?

Port 8609 is assigned by IANA to canon-cpp-disc (Canon Compact Printer Protocol Discovery).

Is port 8609 TCP or UDP?

Port 8609 is registered for UDP.

Is it safe to open port 8609?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 8609 is open?

On Linux run "ss -ltnup 'sport = :8609'", on macOS "lsof -nP -i :8609", and on Windows "netstat -ano | findstr :8609" to see the local process. From another machine, "nmap -p 8609 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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