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// Other services

Port 4667: MMA Comm Services

Port 4667 is assigned by IANA to mmacomm (MMA Comm Services).

4667

How mmacomm works

Other services
client:4667mmacommresponse client:4667mmacommresponse

The client sends a request to port 4667 and the mmacomm 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 4667 dangerous?

We have no specific security note for port 4667. 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 4667

ServicePortTransportDescriptionReferenceUpdated
mmacomm 4667 TCP, UDP MMA Comm Services - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4667, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4667'      # process listening on 4667
sudo lsof -nP -i :4667

macOS

sudo lsof -nP -i :4667

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4667 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4667
netstat -ano | findstr :4667

From another machine

nmap -p 4667 -sV <host>
sudo nmap -sU -p 4667 <host>
nc -zv <host> 4667

Block it in the firewall

sudo ufw deny 4667/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4667" -Direction Inbound -LocalPort 4667 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4667 used for?

Port 4667 is assigned by IANA to mmacomm (MMA Comm Services).

Is port 4667 TCP or UDP?

Port 4667 is registered for TCP and UDP.

Is it safe to open port 4667?

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 4667 is open?

On Linux run "ss -ltnup 'sport = :4667'", on macOS "lsof -nP -i :4667", and on Windows "netstat -ano | findstr :4667" to see the local process. From another machine, "nmap -p 4667 <host>" shows whether it is reachable.

05 Related
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