The Network License Manager controls the licenses that are issued and handles license requests through feature codes. When you start a network version of an Autodesk product, a request is made to the network for a license. You want information about FlexNet feature codes (FLEXlm feature) codes for Autodesk products or other products.
JTB FlexReport (FLEXNet/FLEXlm license graphic reports - Free Trial)