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// Other services

Port 1387: Computer Aided Design Software Inc LM

Port 1387 is assigned by IANA to cadsi-lm (Computer Aided Design Software Inc LM).

1387

How cadsi-lm works

Other services
client:1387cadsi-lmresponse client:1387cadsi-lmresponse

The client sends a request to port 1387 and the cadsi-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 1387 dangerous?

We have no specific security note for port 1387. 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 1387

ServicePortTransportDescriptionReferenceUpdated
cadsi-lm 1387 TCP, UDP Computer Aided Design Software Inc LM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1387, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1387'      # process listening on 1387
sudo lsof -nP -i :1387

macOS

sudo lsof -nP -i :1387

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1387 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1387
netstat -ano | findstr :1387

From another machine

nmap -p 1387 -sV <host>
sudo nmap -sU -p 1387 <host>
nc -zv <host> 1387

Block it in the firewall

sudo ufw deny 1387/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1387" -Direction Inbound -LocalPort 1387 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1387 used for?

Port 1387 is assigned by IANA to cadsi-lm (Computer Aided Design Software Inc LM).

Is port 1387 TCP or UDP?

Port 1387 is registered for TCP and UDP.

Is it safe to open port 1387?

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 1387 is open?

On Linux run "ss -ltnup 'sport = :1387'", on macOS "lsof -nP -i :1387", and on Windows "netstat -ano | findstr :1387" to see the local process. From another machine, "nmap -p 1387 <host>" shows whether it is reachable.

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