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// Other services

Port 4056: Location Message Service

Port 4056 is assigned by IANA to lms (Location Message Service).

4056

How lms works

Other services
client:4056lmsresponse client:4056lmsresponse

The client sends a request to port 4056 and the lms 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 4056 dangerous?

We have no specific security note for port 4056. 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 4056

ServicePortTransportDescriptionReferenceUpdated
lms 4056 TCP, UDP Location Message Service - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4056, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4056'      # process listening on 4056
sudo lsof -nP -i :4056

macOS

sudo lsof -nP -i :4056

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4056 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4056
netstat -ano | findstr :4056

From another machine

nmap -p 4056 -sV <host>
sudo nmap -sU -p 4056 <host>
nc -zv <host> 4056

Block it in the firewall

sudo ufw deny 4056/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4056" -Direction Inbound -LocalPort 4056 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4056 used for?

Port 4056 is assigned by IANA to lms (Location Message Service).

Is port 4056 TCP or UDP?

Port 4056 is registered for TCP and UDP.

Is it safe to open port 4056?

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 4056 is open?

On Linux run "ss -ltnup 'sport = :4056'", on macOS "lsof -nP -i :4056", and on Windows "netstat -ano | findstr :4056" to see the local process. From another machine, "nmap -p 4056 <host>" shows whether it is reachable.

05 Related
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