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// Other services

Port 668: MeComm

Port 668 is assigned by IANA to mecomm (MeComm).

668

How mecomm works

Other services
client:668mecommresponse client:668mecommresponse

The client sends a request to port 668 and the mecomm 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 668 dangerous?

We have no specific security note for port 668. 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 668

ServicePortTransportDescriptionReferenceUpdated
mecomm 668 TCP, UDP MeComm - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 668, and is it reachable?

Linux

sudo ss -ltnup 'sport = :668'      # process listening on 668
sudo lsof -nP -i :668

macOS

sudo lsof -nP -i :668

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 668 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 668
netstat -ano | findstr :668

From another machine

nmap -p 668 -sV <host>
sudo nmap -sU -p 668 <host>
nc -zv <host> 668

Block it in the firewall

sudo ufw deny 668/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 668" -Direction Inbound -LocalPort 668 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 668 used for?

Port 668 is assigned by IANA to mecomm (MeComm).

Is port 668 TCP or UDP?

Port 668 is registered for TCP and UDP.

Is it safe to open port 668?

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 668 is open?

On Linux run "ss -ltnup 'sport = :668'", on macOS "lsof -nP -i :668", and on Windows "netstat -ano | findstr :668" to see the local process. From another machine, "nmap -p 668 <host>" shows whether it is reachable.

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