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// Other services

Port 2681: mpnjsomb

Port 2681 is assigned by IANA to mpnjsomb (mpnjsomb).

2681

How mpnjsomb works

Other services
client:2681mpnjsombresponse client:2681mpnjsombresponse

The client sends a request to port 2681 and the mpnjsomb 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 2681 dangerous?

We have no specific security note for port 2681. 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 2681

ServicePortTransportDescriptionReferenceUpdated
mpnjsomb 2681 TCP, UDP mpnjsomb - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2681, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2681'      # process listening on 2681
sudo lsof -nP -i :2681

macOS

sudo lsof -nP -i :2681

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2681 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2681
netstat -ano | findstr :2681

From another machine

nmap -p 2681 -sV <host>
sudo nmap -sU -p 2681 <host>
nc -zv <host> 2681

Block it in the firewall

sudo ufw deny 2681/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2681" -Direction Inbound -LocalPort 2681 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2681 used for?

Port 2681 is assigned by IANA to mpnjsomb (mpnjsomb).

Is port 2681 TCP or UDP?

Port 2681 is registered for TCP and UDP.

Is it safe to open port 2681?

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 2681 is open?

On Linux run "ss -ltnup 'sport = :2681'", on macOS "lsof -nP -i :2681", and on Windows "netstat -ano | findstr :2681" to see the local process. From another machine, "nmap -p 2681 <host>" shows whether it is reachable.

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