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// Other services

Port 6969: acmsoda

Port 6969 is assigned by IANA to acmsoda (acmsoda).

6969

How acmsoda works

Other services
client:6969acmsodaresponse client:6969acmsodaresponse

The client sends a request to port 6969 and the acmsoda 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 6969 dangerous?

We have no specific security note for port 6969. 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 6969

ServicePortTransportDescriptionReferenceUpdated
acmsoda 6969 TCP, UDP acmsoda - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6969, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6969'      # process listening on 6969
sudo lsof -nP -i :6969

macOS

sudo lsof -nP -i :6969

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6969 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6969
netstat -ano | findstr :6969

From another machine

nmap -p 6969 -sV <host>
sudo nmap -sU -p 6969 <host>
nc -zv <host> 6969

Block it in the firewall

sudo ufw deny 6969/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6969" -Direction Inbound -LocalPort 6969 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6969 used for?

Port 6969 is assigned by IANA to acmsoda (acmsoda).

Is port 6969 TCP or UDP?

Port 6969 is registered for TCP and UDP.

Is it safe to open port 6969?

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 6969 is open?

On Linux run "ss -ltnup 'sport = :6969'", on macOS "lsof -nP -i :6969", and on Windows "netstat -ano | findstr :6969" to see the local process. From another machine, "nmap -p 6969 <host>" shows whether it is reachable.

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