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// Other services

Port 4738: SoleraTec Locator

Port 4738 is assigned by IANA to solera-lpn (SoleraTec Locator).

4738

How solera-lpn works

Other services
client:4738solera-lpnresponse client:4738solera-lpnresponse

The client sends a request to port 4738 and the solera-lpn 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 4738 dangerous?

We have no specific security note for port 4738. 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 4738

ServicePortTransportDescriptionReferenceUpdated
solera-lpn 4738 TCP, UDP SoleraTec Locator - 2005-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4738, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4738'      # process listening on 4738
sudo lsof -nP -i :4738

macOS

sudo lsof -nP -i :4738

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4738 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4738
netstat -ano | findstr :4738

From another machine

nmap -p 4738 -sV <host>
sudo nmap -sU -p 4738 <host>
nc -zv <host> 4738

Block it in the firewall

sudo ufw deny 4738/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4738" -Direction Inbound -LocalPort 4738 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4738 used for?

Port 4738 is assigned by IANA to solera-lpn (SoleraTec Locator).

Is port 4738 TCP or UDP?

Port 4738 is registered for TCP and UDP.

Is it safe to open port 4738?

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 4738 is open?

On Linux run "ss -ltnup 'sport = :4738'", on macOS "lsof -nP -i :4738", and on Windows "netstat -ano | findstr :4738" to see the local process. From another machine, "nmap -p 4738 <host>" shows whether it is reachable.

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