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// Other services

Port 4023: ESNM Zoning Port

Port 4023 is assigned by IANA to esnm-zoning (ESNM Zoning Port).

4023

How esnm-zoning works

Other services
client:4023esnm-zoningresponse client:4023esnm-zoningresponse

The client sends a request to port 4023 and the esnm-zoning 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 4023 dangerous?

We have no specific security note for port 4023. 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 4023

ServicePortTransportDescriptionReferenceUpdated
esnm-zoning 4023 TCP, UDP ESNM Zoning Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4023, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4023'      # process listening on 4023
sudo lsof -nP -i :4023

macOS

sudo lsof -nP -i :4023

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4023 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4023
netstat -ano | findstr :4023

From another machine

nmap -p 4023 -sV <host>
sudo nmap -sU -p 4023 <host>
nc -zv <host> 4023

Block it in the firewall

sudo ufw deny 4023/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4023" -Direction Inbound -LocalPort 4023 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4023 used for?

Port 4023 is assigned by IANA to esnm-zoning (ESNM Zoning Port).

Is port 4023 TCP or UDP?

Port 4023 is registered for TCP and UDP.

Is it safe to open port 4023?

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 4023 is open?

On Linux run "ss -ltnup 'sport = :4023'", on macOS "lsof -nP -i :4023", and on Windows "netstat -ano | findstr :4023" to see the local process. From another machine, "nmap -p 4023 <host>" shows whether it is reachable.

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