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// Other services

Port 6656: Emergency Message Control Service

Port 6656 is assigned by IANA to emgmsg (Emergency Message Control Service).

6656

How emgmsg works

Other services
client:6656emgmsgresponse client:6656emgmsgresponse

The client sends a request to port 6656 and the emgmsg 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 6656 dangerous?

We have no specific security note for port 6656. 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 6656

ServicePortTransportDescriptionReferenceUpdated
emgmsg 6656 TCP Emergency Message Control Service - 2010-12-06
-6656-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6656, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6656'      # process listening on 6656
sudo lsof -nP -i :6656

macOS

sudo lsof -nP -i :6656

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6656 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6656
netstat -ano | findstr :6656

From another machine

nmap -p 6656 -sV <host>
nc -zv <host> 6656

Block it in the firewall

sudo ufw deny 6656/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6656" -Direction Inbound -LocalPort 6656 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6656 used for?

Port 6656 is assigned by IANA to emgmsg (Emergency Message Control Service).

Is port 6656 TCP or UDP?

Port 6656 is registered for TCP.

Is it safe to open port 6656?

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 6656 is open?

On Linux run "ss -ltnup 'sport = :6656'", on macOS "lsof -nP -i :6656", and on Windows "netstat -ano | findstr :6656" to see the local process. From another machine, "nmap -p 6656 <host>" shows whether it is reachable.

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