An easy cross platform way of determining the correct hostid for your system is to use our license tools.
The first step is to download our license tool distribution and extract them to a directory of your choosing - once you have extracted the tools you will need to open a command prompt/terminal, change to the directory where the tools were extracted and run the appropriate command below for your OS of choice.
rlmutil rlmhostid ether
rlmutil rlmhostid -q ether
on the server that will host the licenses (for floating licenses) or the local workstation where the software will be used (for node locked licenses).
This will return a 12 digit hexidecimal value (which is the hostid) that looks like: