CyberHunter
Local dataset, no network
// Other services

Port 3609: CPDI PIDAS Connection Mon

Port 3609 is assigned by IANA to cpdi-pidas-cm (CPDI PIDAS Connection Mon).

3609

How cpdi-pidas-cm works

Other services
client:3609cpdi-pidas-cmresponse client:3609cpdi-pidas-cmresponse

The client sends a request to port 3609 and the cpdi-pidas-cm service answers.

Transport
TCP · 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
Other services
01 Security

Is port 3609 dangerous?

We have no specific security note for port 3609. 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 3609

ServicePortTransportDescriptionReferenceUpdated
cpdi-pidas-cm 3609 TCP, UDP CPDI PIDAS Connection Mon - 2002-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 3609, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3609'      # process listening on 3609
sudo lsof -nP -i :3609

macOS

sudo lsof -nP -i :3609

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3609 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3609
netstat -ano | findstr :3609

From another machine

nmap -p 3609 -sV <host>
sudo nmap -sU -p 3609 <host>
nc -zv <host> 3609

Block it in the firewall

sudo ufw deny 3609/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3609" -Direction Inbound -LocalPort 3609 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3609 used for?

Port 3609 is assigned by IANA to cpdi-pidas-cm (CPDI PIDAS Connection Mon).

Is port 3609 TCP or UDP?

Port 3609 is registered for TCP and UDP.

Is it safe to open port 3609?

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 3609 is open?

On Linux run "ss -ltnup 'sport = :3609'", on macOS "lsof -nP -i :3609", and on Windows "netstat -ano | findstr :3609" to see the local process. From another machine, "nmap -p 3609 <host>" shows whether it is reachable.

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