CyberHunter
Local dataset, no network
// Other services

Port 4661: Kar2ouche Peer location service

Port 4661 is assigned by IANA to kar2ouche (Kar2ouche Peer location service).

4661

How kar2ouche works

Other services
client:4661kar2oucheresponse client:4661kar2oucheresponse

The client sends a request to port 4661 and the kar2ouche 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 4661 dangerous?

We have no specific security note for port 4661. 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 4661

ServicePortTransportDescriptionReferenceUpdated
kar2ouche 4661 TCP, UDP Kar2ouche Peer location service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4661, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4661'      # process listening on 4661
sudo lsof -nP -i :4661

macOS

sudo lsof -nP -i :4661

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4661 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4661
netstat -ano | findstr :4661

From another machine

nmap -p 4661 -sV <host>
sudo nmap -sU -p 4661 <host>
nc -zv <host> 4661

Block it in the firewall

sudo ufw deny 4661/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4661" -Direction Inbound -LocalPort 4661 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4661 used for?

Port 4661 is assigned by IANA to kar2ouche (Kar2ouche Peer location service).

Is port 4661 TCP or UDP?

Port 4661 is registered for TCP and UDP.

Is it safe to open port 4661?

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 4661 is open?

On Linux run "ss -ltnup 'sport = :4661'", on macOS "lsof -nP -i :4661", and on Windows "netstat -ano | findstr :4661" to see the local process. From another machine, "nmap -p 4661 <host>" shows whether it is reachable.

05 Related
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