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// Other services

Port 23003: Inova LightLink Server Type 4

Port 23003 is assigned by IANA to inovaport4 (Inova LightLink Server Type 4).

23003

How inovaport4 works

Other services
client:23003inovaport4response client:23003inovaport4response

The client sends a request to port 23003 and the inovaport4 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 23003 dangerous?

We have no specific security note for port 23003. 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 23003

ServicePortTransportDescriptionReferenceUpdated
inovaport4 23003 TCP, UDP Inova LightLink Server Type 4 - 2006-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 23003, and is it reachable?

Linux

sudo ss -ltnup 'sport = :23003'      # process listening on 23003
sudo lsof -nP -i :23003

macOS

sudo lsof -nP -i :23003

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 23003 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 23003
netstat -ano | findstr :23003

From another machine

nmap -p 23003 -sV <host>
sudo nmap -sU -p 23003 <host>
nc -zv <host> 23003

Block it in the firewall

sudo ufw deny 23003/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 23003" -Direction Inbound -LocalPort 23003 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 23003 used for?

Port 23003 is assigned by IANA to inovaport4 (Inova LightLink Server Type 4).

Is port 23003 TCP or UDP?

Port 23003 is registered for TCP and UDP.

Is it safe to open port 23003?

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 23003 is open?

On Linux run "ss -ltnup 'sport = :23003'", on macOS "lsof -nP -i :23003", and on Windows "netstat -ano | findstr :23003" to see the local process. From another machine, "nmap -p 23003 <host>" shows whether it is reachable.

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