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// Other services

Port 384: A Remote Network Server System

Port 384 is assigned by IANA to arns (A Remote Network Server System).

384

How arns works

Other services
client:384arnsresponse client:384arnsresponse

The client sends a request to port 384 and the arns 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 384 dangerous?

We have no specific security note for port 384. 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 384

ServicePortTransportDescriptionReferenceUpdated
arns 384 TCP, UDP A Remote Network Server System - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 384, and is it reachable?

Linux

sudo ss -ltnup 'sport = :384'      # process listening on 384
sudo lsof -nP -i :384

macOS

sudo lsof -nP -i :384

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 384 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 384
netstat -ano | findstr :384

From another machine

nmap -p 384 -sV <host>
sudo nmap -sU -p 384 <host>
nc -zv <host> 384

Block it in the firewall

sudo ufw deny 384/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 384" -Direction Inbound -LocalPort 384 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 384 used for?

Port 384 is assigned by IANA to arns (A Remote Network Server System).

Is port 384 TCP or UDP?

Port 384 is registered for TCP and UDP.

Is it safe to open port 384?

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 384 is open?

On Linux run "ss -ltnup 'sport = :384'", on macOS "lsof -nP -i :384", and on Windows "netstat -ano | findstr :384" to see the local process. From another machine, "nmap -p 384 <host>" shows whether it is reachable.

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