CyberHunter
Local dataset, no network
// Other services

Port 1539: Intellistor License Manager

Port 1539 is assigned by IANA to intellistor-lm (Intellistor License Manager).

1539

How intellistor-lm works

Other services
client:1539intellistor-lmresponse client:1539intellistor-lmresponse

The client sends a request to port 1539 and the intellistor-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 1539 dangerous?

We have no specific security note for port 1539. 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 1539

ServicePortTransportDescriptionReferenceUpdated
intellistor-lm 1539 TCP, UDP Intellistor License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1539, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1539'      # process listening on 1539
sudo lsof -nP -i :1539

macOS

sudo lsof -nP -i :1539

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1539 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1539
netstat -ano | findstr :1539

From another machine

nmap -p 1539 -sV <host>
sudo nmap -sU -p 1539 <host>
nc -zv <host> 1539

Block it in the firewall

sudo ufw deny 1539/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1539" -Direction Inbound -LocalPort 1539 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1539 used for?

Port 1539 is assigned by IANA to intellistor-lm (Intellistor License Manager).

Is port 1539 TCP or UDP?

Port 1539 is registered for TCP and UDP.

Is it safe to open port 1539?

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 1539 is open?

On Linux run "ss -ltnup 'sport = :1539'", on macOS "lsof -nP -i :1539", and on Windows "netstat -ano | findstr :1539" to see the local process. From another machine, "nmap -p 1539 <host>" shows whether it is reachable.

05 Related
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