CyberHunter
Local dataset, no network
// Other services

Port 1800: ANSYS-License manager

Port 1800 is assigned by IANA to ansys-lm (ANSYS-License manager).

1800

How ansys-lm works

Other services
client:1800ansys-lmresponse client:1800ansys-lmresponse

The client sends a request to port 1800 and the ansys-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 1800 dangerous?

We have no specific security note for port 1800. 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 1800

ServicePortTransportDescriptionReferenceUpdated
ansys-lm 1800 TCP, UDP ANSYS-License manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1800, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1800'      # process listening on 1800
sudo lsof -nP -i :1800

macOS

sudo lsof -nP -i :1800

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1800 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1800
netstat -ano | findstr :1800

From another machine

nmap -p 1800 -sV <host>
sudo nmap -sU -p 1800 <host>
nc -zv <host> 1800

Block it in the firewall

sudo ufw deny 1800/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1800" -Direction Inbound -LocalPort 1800 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1800 used for?

Port 1800 is assigned by IANA to ansys-lm (ANSYS-License manager).

Is port 1800 TCP or UDP?

Port 1800 is registered for TCP and UDP.

Is it safe to open port 1800?

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 1800 is open?

On Linux run "ss -ltnup 'sport = :1800'", on macOS "lsof -nP -i :1800", and on Windows "netstat -ano | findstr :1800" to see the local process. From another machine, "nmap -p 1800 <host>" shows whether it is reachable.

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