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// Other services

Port 3383: Enterprise Software Products License Manager

Port 3383 is assigned by IANA to esp-lm (Enterprise Software Products License Manager).

3383

How esp-lm works

Other services
client:3383esp-lmresponse client:3383esp-lmresponse

The client sends a request to port 3383 and the esp-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 3383 dangerous?

We have no specific security note for port 3383. 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 3383

ServicePortTransportDescriptionReferenceUpdated
esp-lm 3383 TCP, UDP Enterprise Software Products License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3383, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3383'      # process listening on 3383
sudo lsof -nP -i :3383

macOS

sudo lsof -nP -i :3383

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3383 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3383
netstat -ano | findstr :3383

From another machine

nmap -p 3383 -sV <host>
sudo nmap -sU -p 3383 <host>
nc -zv <host> 3383

Block it in the firewall

sudo ufw deny 3383/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3383" -Direction Inbound -LocalPort 3383 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3383 used for?

Port 3383 is assigned by IANA to esp-lm (Enterprise Software Products License Manager).

Is port 3383 TCP or UDP?

Port 3383 is registered for TCP and UDP.

Is it safe to open port 3383?

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 3383 is open?

On Linux run "ss -ltnup 'sport = :3383'", on macOS "lsof -nP -i :3383", and on Windows "netstat -ano | findstr :3383" to see the local process. From another machine, "nmap -p 3383 <host>" shows whether it is reachable.

05 Related
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