CyberHunter
Local dataset, no network
// Other services

Port 3839: AMX Resource Management Suite

Port 3839 is assigned by IANA to amx-rms (AMX Resource Management Suite).

3839

How amx-rms works

Other services
client:3839amx-rmsresponse client:3839amx-rmsresponse

The client sends a request to port 3839 and the amx-rms 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 3839 dangerous?

We have no specific security note for port 3839. 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 3839

ServicePortTransportDescriptionReferenceUpdated
amx-rms 3839 TCP, UDP AMX Resource Management Suite - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3839, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3839'      # process listening on 3839
sudo lsof -nP -i :3839

macOS

sudo lsof -nP -i :3839

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3839 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3839
netstat -ano | findstr :3839

From another machine

nmap -p 3839 -sV <host>
sudo nmap -sU -p 3839 <host>
nc -zv <host> 3839

Block it in the firewall

sudo ufw deny 3839/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3839" -Direction Inbound -LocalPort 3839 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3839 used for?

Port 3839 is assigned by IANA to amx-rms (AMX Resource Management Suite).

Is port 3839 TCP or UDP?

Port 3839 is registered for TCP and UDP.

Is it safe to open port 3839?

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 3839 is open?

On Linux run "ss -ltnup 'sport = :3839'", on macOS "lsof -nP -i :3839", and on Windows "netstat -ano | findstr :3839" to see the local process. From another machine, "nmap -p 3839 <host>" shows whether it is reachable.

05 Related
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