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// Other services

Port 4597: A21 (AN-1xBS)

Port 4597 is assigned by IANA to a21-an-1xbs (A21 (AN-1xBS)).

4597

How a21-an-1xbs works

Other services
client:4597a21-an-1xbsresponse client:4597a21-an-1xbsresponse

The client sends a request to port 4597 and the a21-an-1xbs 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 4597 dangerous?

We have no specific security note for port 4597. 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 4597

ServicePortTransportDescriptionReferenceUpdated
a21-an-1xbs 4597 TCP, UDP A21 (AN-1xBS) - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4597, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4597'      # process listening on 4597
sudo lsof -nP -i :4597

macOS

sudo lsof -nP -i :4597

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4597 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4597
netstat -ano | findstr :4597

From another machine

nmap -p 4597 -sV <host>
sudo nmap -sU -p 4597 <host>
nc -zv <host> 4597

Block it in the firewall

sudo ufw deny 4597/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4597" -Direction Inbound -LocalPort 4597 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4597 used for?

Port 4597 is assigned by IANA to a21-an-1xbs (A21 (AN-1xBS)).

Is port 4597 TCP or UDP?

Port 4597 is registered for TCP and UDP.

Is it safe to open port 4597?

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 4597 is open?

On Linux run "ss -ltnup 'sport = :4597'", on macOS "lsof -nP -i :4597", and on Windows "netstat -ano | findstr :4597" to see the local process. From another machine, "nmap -p 4597 <host>" shows whether it is reachable.

05 Related
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