CyberHunter
Local dataset, no network
// Other services

Port 6690: CLEVERDetect Message Service

Port 6690 is assigned by IANA to cleverdetect (CLEVERDetect Message Service).

6690

How cleverdetect works

Other services
client:6690cleverdetectresponse client:6690cleverdetectresponse

The client sends a request to port 6690 and the cleverdetect 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 6690 dangerous?

We have no specific security note for port 6690. 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 6690

ServicePortTransportDescriptionReferenceUpdated
cleverdetect 6690 TCP CLEVERDetect Message Service - 2014-12-03
-6690-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6690, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6690'      # process listening on 6690
sudo lsof -nP -i :6690

macOS

sudo lsof -nP -i :6690

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6690 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6690
netstat -ano | findstr :6690

From another machine

nmap -p 6690 -sV <host>
nc -zv <host> 6690

Block it in the firewall

sudo ufw deny 6690/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6690" -Direction Inbound -LocalPort 6690 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6690 used for?

Port 6690 is assigned by IANA to cleverdetect (CLEVERDetect Message Service).

Is port 6690 TCP or UDP?

Port 6690 is registered for TCP.

Is it safe to open port 6690?

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 6690 is open?

On Linux run "ss -ltnup 'sport = :6690'", on macOS "lsof -nP -i :6690", and on Windows "netstat -ano | findstr :6690" to see the local process. From another machine, "nmap -p 6690 <host>" shows whether it is reachable.

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