CyberHunter
Local dataset, no network
// Other services

Port 6841: Netmo Default

Port 6841 is assigned by IANA to netmo-default (Netmo Default).

6841

How netmo-default works

Other services
client:6841netmo-defaultresponse client:6841netmo-defaultresponse

The client sends a request to port 6841 and the netmo-default 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 6841 dangerous?

We have no specific security note for port 6841. 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 6841

ServicePortTransportDescriptionReferenceUpdated
netmo-default 6841 TCP, UDP Netmo Default - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6841, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6841'      # process listening on 6841
sudo lsof -nP -i :6841

macOS

sudo lsof -nP -i :6841

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6841 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6841
netstat -ano | findstr :6841

From another machine

nmap -p 6841 -sV <host>
sudo nmap -sU -p 6841 <host>
nc -zv <host> 6841

Block it in the firewall

sudo ufw deny 6841/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6841" -Direction Inbound -LocalPort 6841 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6841 used for?

Port 6841 is assigned by IANA to netmo-default (Netmo Default).

Is port 6841 TCP or UDP?

Port 6841 is registered for TCP and UDP.

Is it safe to open port 6841?

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 6841 is open?

On Linux run "ss -ltnup 'sport = :6841'", on macOS "lsof -nP -i :6841", and on Windows "netstat -ano | findstr :6841" to see the local process. From another machine, "nmap -p 6841 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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