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// Other services

Port 4392: American Printware RXServer Protocol

Port 4392 is assigned by IANA to apwi-rxserver (American Printware RXServer Protocol).

4392

How apwi-rxserver works

Other services
client:4392apwi-rxserverresponse client:4392apwi-rxserverresponse

The client sends a request to port 4392 and the apwi-rxserver 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 4392 dangerous?

We have no specific security note for port 4392. 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 4392

ServicePortTransportDescriptionReferenceUpdated
apwi-rxserver 4392 TCP American Printware RXServer Protocol - 2009-02-12
-4392-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4392, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4392'      # process listening on 4392
sudo lsof -nP -i :4392

macOS

sudo lsof -nP -i :4392

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4392 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4392
netstat -ano | findstr :4392

From another machine

nmap -p 4392 -sV <host>
nc -zv <host> 4392

Block it in the firewall

sudo ufw deny 4392/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4392" -Direction Inbound -LocalPort 4392 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4392 used for?

Port 4392 is assigned by IANA to apwi-rxserver (American Printware RXServer Protocol).

Is port 4392 TCP or UDP?

Port 4392 is registered for TCP.

Is it safe to open port 4392?

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 4392 is open?

On Linux run "ss -ltnup 'sport = :4392'", on macOS "lsof -nP -i :4392", and on Windows "netstat -ano | findstr :4392" to see the local process. From another machine, "nmap -p 4392 <host>" shows whether it is reachable.

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