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// Other services

Port 4059: DLMS/COSEM

Port 4059 is assigned by IANA to dlms-cosem (DLMS/COSEM).

4059

How dlms-cosem works

Other services
client:4059dlms-cosemresponse client:4059dlms-cosemresponse

The client sends a request to port 4059 and the dlms-cosem 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 4059 dangerous?

We have no specific security note for port 4059. 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 4059

ServicePortTransportDescriptionReferenceUpdated
dlms-cosem 4059 TCP, UDP DLMS/COSEM - 2006-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 4059, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4059'      # process listening on 4059
sudo lsof -nP -i :4059

macOS

sudo lsof -nP -i :4059

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4059 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4059
netstat -ano | findstr :4059

From another machine

nmap -p 4059 -sV <host>
sudo nmap -sU -p 4059 <host>
nc -zv <host> 4059

Block it in the firewall

sudo ufw deny 4059/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4059" -Direction Inbound -LocalPort 4059 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4059 used for?

Port 4059 is assigned by IANA to dlms-cosem (DLMS/COSEM).

Is port 4059 TCP or UDP?

Port 4059 is registered for TCP and UDP.

Is it safe to open port 4059?

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 4059 is open?

On Linux run "ss -ltnup 'sport = :4059'", on macOS "lsof -nP -i :4059", and on Windows "netstat -ano | findstr :4059" to see the local process. From another machine, "nmap -p 4059 <host>" shows whether it is reachable.

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