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// Other services

Port 1538: 3ds-lm

Port 1538 is assigned by IANA to 3ds-lm (3ds-lm).

1538

How 3ds-lm works

Other services
client:15383ds-lmresponse client:15383ds-lmresponse

The client sends a request to port 1538 and the 3ds-lm 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 1538 dangerous?

We have no specific security note for port 1538. 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 1538

ServicePortTransportDescriptionReferenceUpdated
3ds-lm 1538 TCP, UDP 3ds-lm - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1538, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1538'      # process listening on 1538
sudo lsof -nP -i :1538

macOS

sudo lsof -nP -i :1538

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1538 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1538
netstat -ano | findstr :1538

From another machine

nmap -p 1538 -sV <host>
sudo nmap -sU -p 1538 <host>
nc -zv <host> 1538

Block it in the firewall

sudo ufw deny 1538/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1538" -Direction Inbound -LocalPort 1538 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1538 used for?

Port 1538 is assigned by IANA to 3ds-lm (3ds-lm).

Is port 1538 TCP or UDP?

Port 1538 is registered for TCP and UDP.

Is it safe to open port 1538?

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 1538 is open?

On Linux run "ss -ltnup 'sport = :1538'", on macOS "lsof -nP -i :1538", and on Windows "netstat -ano | findstr :1538" to see the local process. From another machine, "nmap -p 1538 <host>" shows whether it is reachable.

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