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// Other services

Port 6688: CleverView for TCP/IP Message Service

Port 6688 is assigned by IANA to clever-tcpip (CleverView for TCP/IP Message Service).

6688

How clever-tcpip works

Other services
client:6688clever-tcpipresponse client:6688clever-tcpipresponse

The client sends a request to port 6688 and the clever-tcpip 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 6688 dangerous?

We have no specific security note for port 6688. 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 6688

ServicePortTransportDescriptionReferenceUpdated
clever-tcpip 6688 TCP CleverView for TCP/IP Message Service - 2009-10-13
-6688-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6688, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6688'      # process listening on 6688
sudo lsof -nP -i :6688

macOS

sudo lsof -nP -i :6688

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6688 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6688
netstat -ano | findstr :6688

From another machine

nmap -p 6688 -sV <host>
nc -zv <host> 6688

Block it in the firewall

sudo ufw deny 6688/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6688" -Direction Inbound -LocalPort 6688 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6688 used for?

Port 6688 is assigned by IANA to clever-tcpip (CleverView for TCP/IP Message Service).

Is port 6688 TCP or UDP?

Port 6688 is registered for TCP.

Is it safe to open port 6688?

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 6688 is open?

On Linux run "ss -ltnup 'sport = :6688'", on macOS "lsof -nP -i :6688", and on Windows "netstat -ano | findstr :6688" to see the local process. From another machine, "nmap -p 6688 <host>" shows whether it is reachable.

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