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// Other services

Port 8666: Monetra Administrative Access

Port 8666 is assigned by IANA to monetra-admin (Monetra Administrative Access).

8666

How monetra-admin works

Other services
client:8666monetra-adminresponse client:8666monetra-adminresponse

The client sends a request to port 8666 and the monetra-admin service answers.

Transport
TCP
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 8666 dangerous?

We have no specific security note for port 8666. 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 8666

ServicePortTransportDescriptionReferenceUpdated
monetra-admin 8666 TCP Monetra Administrative Access - 2013-04-02
-8666-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8666, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8666'      # process listening on 8666
sudo lsof -nP -i :8666

macOS

sudo lsof -nP -i :8666

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8666 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8666
netstat -ano | findstr :8666

From another machine

nmap -p 8666 -sV <host>
nc -zv <host> 8666

Block it in the firewall

sudo ufw deny 8666/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8666" -Direction Inbound -LocalPort 8666 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8666 used for?

Port 8666 is assigned by IANA to monetra-admin (Monetra Administrative Access).

Is port 8666 TCP or UDP?

Port 8666 is registered for TCP.

Is it safe to open port 8666?

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 8666 is open?

On Linux run "ss -ltnup 'sport = :8666'", on macOS "lsof -nP -i :8666", and on Windows "netstat -ano | findstr :8666" to see the local process. From another machine, "nmap -p 8666 <host>" shows whether it is reachable.

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