Hi,
Visually, you can check it under the Computers tab of the Itoo Software License Manager - there is an informative list, that shows actual computer(s) data (Hostname, IP address, Start Time, Product) that are using available seats. Let me mention, that if preferred, though it's not possible to get these data directly from the license server, it generates a log file with this information. I hope that helps.
Best regards,