CyberHunter
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// Other services

Port 1537: isi-lm

Port 1537 is assigned by IANA to sdsc-lm (isi-lm).

1537

How sdsc-lm works

Other services
client:1537sdsc-lmresponse client:1537sdsc-lmresponse

The client sends a request to port 1537 and the sdsc-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 1537 dangerous?

We have no specific security note for port 1537. 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 1537

ServicePortTransportDescriptionReferenceUpdated
sdsc-lm 1537 TCP, UDP isi-lm - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1537, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1537'      # process listening on 1537
sudo lsof -nP -i :1537

macOS

sudo lsof -nP -i :1537

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1537 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1537
netstat -ano | findstr :1537

From another machine

nmap -p 1537 -sV <host>
sudo nmap -sU -p 1537 <host>
nc -zv <host> 1537

Block it in the firewall

sudo ufw deny 1537/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1537" -Direction Inbound -LocalPort 1537 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1537 used for?

Port 1537 is assigned by IANA to sdsc-lm (isi-lm).

Is port 1537 TCP or UDP?

Port 1537 is registered for TCP and UDP.

Is it safe to open port 1537?

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 1537 is open?

On Linux run "ss -ltnup 'sport = :1537'", on macOS "lsof -nP -i :1537", and on Windows "netstat -ano | findstr :1537" to see the local process. From another machine, "nmap -p 1537 <host>" shows whether it is reachable.

05 Related
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