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// Other services

Port 4393: American Printware RXSpooler Protocol

Port 4393 is assigned by IANA to apwi-rxspooler (American Printware RXSpooler Protocol).

4393

How apwi-rxspooler works

Other services
client:4393apwi-rxspoolerresponse client:4393apwi-rxspoolerresponse

The client sends a request to port 4393 and the apwi-rxspooler 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 4393 dangerous?

We have no specific security note for port 4393. 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 4393

ServicePortTransportDescriptionReferenceUpdated
apwi-rxspooler 4393 TCP American Printware RXSpooler Protocol - 2009-02-12
-4393-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4393, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4393'      # process listening on 4393
sudo lsof -nP -i :4393

macOS

sudo lsof -nP -i :4393

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4393 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4393
netstat -ano | findstr :4393

From another machine

nmap -p 4393 -sV <host>
nc -zv <host> 4393

Block it in the firewall

sudo ufw deny 4393/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4393" -Direction Inbound -LocalPort 4393 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4393 used for?

Port 4393 is assigned by IANA to apwi-rxspooler (American Printware RXSpooler Protocol).

Is port 4393 TCP or UDP?

Port 4393 is registered for TCP.

Is it safe to open port 4393?

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 4393 is open?

On Linux run "ss -ltnup 'sport = :4393'", on macOS "lsof -nP -i :4393", and on Windows "netstat -ano | findstr :4393" to see the local process. From another machine, "nmap -p 4393 <host>" shows whether it is reachable.

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