Step 1: Get the Hostid

The "hostid" is required for users with floating or node-locked licenses. Users of the demo version can proceed with → "Step 4: License Wizard".

  • Every computer has at least one unique hostid.

  • Once the Id has been added to your license it cannot be changed anymore – this process is final. 

  • In the “Customer Gateway” of RealFlow's website you have to enter the “hostid” and claim your license file. 

  • The hostid on the license must match the hostid of the computer where your RLM server will run.

Getting the Hostid - License Wizard

When RealFlow is opened and unlicensed you will see the license wizard:

  • Go to the last option called "I want to find the hostid of this machine".

  • This option will show you the Id for the computer on which RealFlow is running.

  • If you can see more than one Id just choose one of them.


Getting the Hostid - OS X

OS X user can go to the computer’s "System Preferences", choose Ethernet 1 and open Network > More Options... > Hardware.

Under "MAC address" you will see something like 0a:22:ef:de:2f:5e (example only!). Remove the colons (:) and use the id for RealFlow's licensing process.

Getting the Hostid - Terminal

To get the "hostid" from a computer, go to the "rlm" folder of the RealFlow installation. There you will find the "rlmhostid" application. You can copy the application to the computer from which you want to know the "hostid".


C:\Program Files\Next Limit\RealFlow 10\rlm


"rlm" folder of your RealFlow installation


Applications/RealFlow 10/rlm

Now open a terminal program (e.g. Command Prompt, Bash, Terminal). Use the "cd" command to browse to the directory where "rlmhostid" has been stored, for example under "Downloads"


cd /Documents and Settings/user_name/Downloads


cd /user_name/Downloads


cd "/user_name/Downloads"


Enter the following command:


rlmhostid -ether


./rlmhostid -ether


./rlmhostid -ether

You will see a terminal message providing the required host Id. If you can see more than one Id just choose one of them.

Here a screenshot from Windows (the Id in the screenshot is an example and does not represent the actual code):