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// Other services

Port 4419: Colnod Binary Protocol

Port 4419 is assigned by IANA to cbp (Colnod Binary Protocol).

4419

How cbp works

Other services
client:4419cbpresponse client:4419cbpresponse

The client sends a request to port 4419 and the cbp service answers.

Transport
TCP
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
Other services
01 Security

Is port 4419 dangerous?

We have no specific security note for port 4419. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 4419

ServicePortTransportDescriptionReferenceUpdated
cbp 4419 TCP Colnod Binary Protocol - 2016-03-23
-4419-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4419, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4419'      # process listening on 4419
sudo lsof -nP -i :4419

macOS

sudo lsof -nP -i :4419

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4419 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4419
netstat -ano | findstr :4419

From another machine

nmap -p 4419 -sV <host>
nc -zv <host> 4419

Block it in the firewall

sudo ufw deny 4419/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4419" -Direction Inbound -LocalPort 4419 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4419 used for?

Port 4419 is assigned by IANA to cbp (Colnod Binary Protocol).

Is port 4419 TCP or UDP?

Port 4419 is registered for TCP.

Is it safe to open port 4419?

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. Close the port if nothing on the host needs it.

How do I check if port 4419 is open?

On Linux run "ss -ltnup 'sport = :4419'", on macOS "lsof -nP -i :4419", and on Windows "netstat -ano | findstr :4419" to see the local process. From another machine, "nmap -p 4419 <host>" shows whether it is reachable.

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