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// Other services

Port 6961: JMACT3

Port 6961 is assigned by IANA to jmact3 (JMACT3).

6961

How jmact3 works

Other services
client:6961jmact3response client:6961jmact3response

The client sends a request to port 6961 and the jmact3 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 6961 dangerous?

We have no specific security note for port 6961. 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 6961

ServicePortTransportDescriptionReferenceUpdated
jmact3 6961 TCP, UDP JMACT3 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6961, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6961'      # process listening on 6961
sudo lsof -nP -i :6961

macOS

sudo lsof -nP -i :6961

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6961 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6961
netstat -ano | findstr :6961

From another machine

nmap -p 6961 -sV <host>
sudo nmap -sU -p 6961 <host>
nc -zv <host> 6961

Block it in the firewall

sudo ufw deny 6961/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6961" -Direction Inbound -LocalPort 6961 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6961 used for?

Port 6961 is assigned by IANA to jmact3 (JMACT3).

Is port 6961 TCP or UDP?

Port 6961 is registered for TCP and UDP.

Is it safe to open port 6961?

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 6961 is open?

On Linux run "ss -ltnup 'sport = :6961'", on macOS "lsof -nP -i :6961", and on Windows "netstat -ano | findstr :6961" to see the local process. From another machine, "nmap -p 6961 <host>" shows whether it is reachable.

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