You will see a list of license numbers.If you click on one of them, you will see a list of products associated with the license. On the page that shows that, click on "Install and Activate" and on the page that shows up from there, "View Current Activations". That will show a list of Activation Labels. The host ID shown for each will generally be for the "first" MAC address on the computer; you can click on the activation label to be shown a complete list of Mac addresses.
The process is a bit of a pain.
The URL in part goes https://www.mathworks.com/licensecenter/licenses/ followed by the license number. But I have not been able to figure out what the number component after that corresponds to. The last component of the URL is "activations" -- but View Current Activations does not have a separate URL so even if you knew the magic number for the intermediate component, you would not be able to get directly to the detailed list.