CyberHunter
Local dataset, no network
// Other services

Port 4372: LAN2CAN Data

Port 4372 is assigned by IANA to l2c-data (LAN2CAN Data).

4372

How l2c-data works

Other services
client:4372l2c-dataresponse client:4372l2c-dataresponse

The client sends a request to port 4372 and the l2c-data 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 4372 dangerous?

We have no specific security note for port 4372. 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 4372

ServicePortTransportDescriptionReferenceUpdated
l2c-data 4372 TCP, UDP LAN2CAN Data - 2008-07-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 4372, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4372'      # process listening on 4372
sudo lsof -nP -i :4372

macOS

sudo lsof -nP -i :4372

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4372 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4372
netstat -ano | findstr :4372

From another machine

nmap -p 4372 -sV <host>
sudo nmap -sU -p 4372 <host>
nc -zv <host> 4372

Block it in the firewall

sudo ufw deny 4372/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4372" -Direction Inbound -LocalPort 4372 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4372 used for?

Port 4372 is assigned by IANA to l2c-data (LAN2CAN Data).

Is port 4372 TCP or UDP?

Port 4372 is registered for TCP and UDP.

Is it safe to open port 4372?

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 4372 is open?

On Linux run "ss -ltnup 'sport = :4372'", on macOS "lsof -nP -i :4372", and on Windows "netstat -ano | findstr :4372" to see the local process. From another machine, "nmap -p 4372 <host>" shows whether it is reachable.

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