CyberHunter
Local dataset, no network
// Other services

Port 40023: K-PatentsSensorInformation

Port 40023 is assigned by IANA to k-patentssensor (K-PatentsSensorInformation).

40023

How k-patentssensor works

Other services
client:40023k-patentssensorresponse client:40023k-patentssensorresponse

The client sends a request to port 40023 and the k-patentssensor service answers.

Transport
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 40023 dangerous?

We have no specific security note for port 40023. 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 40023

ServicePortTransportDescriptionReferenceUpdated
k-patentssensor 40023 UDP K-PatentsSensorInformation - 2021-02-02
-40023-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 40023, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40023'      # process listening on 40023
sudo lsof -nP -i :40023

macOS

sudo lsof -nP -i :40023

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40023 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40023
netstat -ano | findstr :40023

From another machine

nmap -p 40023 -sV <host>
sudo nmap -sU -p 40023 <host>
nc -zv <host> 40023

Block it in the firewall

sudo ufw deny 40023/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40023" -Direction Inbound -LocalPort 40023 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 40023 used for?

Port 40023 is assigned by IANA to k-patentssensor (K-PatentsSensorInformation).

Is port 40023 TCP or UDP?

Port 40023 is registered for UDP.

Is it safe to open port 40023?

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 40023 is open?

On Linux run "ss -ltnup 'sport = :40023'", on macOS "lsof -nP -i :40023", and on Windows "netstat -ano | findstr :40023" to see the local process. From another machine, "nmap -p 40023 <host>" shows whether it is reachable.

05 Related
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