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// Other services

Port 1428: Informatik License Manager

Port 1428 is assigned by IANA to informatik-lm (Informatik License Manager).

1428

How informatik-lm works

Other services
client:1428informatik-lmresponse client:1428informatik-lmresponse

The client sends a request to port 1428 and the informatik-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 1428 dangerous?

We have no specific security note for port 1428. 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 1428

ServicePortTransportDescriptionReferenceUpdated
informatik-lm 1428 TCP, UDP Informatik License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1428, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1428'      # process listening on 1428
sudo lsof -nP -i :1428

macOS

sudo lsof -nP -i :1428

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1428 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1428
netstat -ano | findstr :1428

From another machine

nmap -p 1428 -sV <host>
sudo nmap -sU -p 1428 <host>
nc -zv <host> 1428

Block it in the firewall

sudo ufw deny 1428/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1428" -Direction Inbound -LocalPort 1428 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1428 used for?

Port 1428 is assigned by IANA to informatik-lm (Informatik License Manager).

Is port 1428 TCP or UDP?

Port 1428 is registered for TCP and UDP.

Is it safe to open port 1428?

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 1428 is open?

On Linux run "ss -ltnup 'sport = :1428'", on macOS "lsof -nP -i :1428", and on Windows "netstat -ano | findstr :1428" to see the local process. From another machine, "nmap -p 1428 <host>" shows whether it is reachable.

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