Microsoft created a  toolkit called Microsoft Assessment and Planning Toolkit that helps IT to discover current infrastructure for variety of migration projects.  This tool kit covers below scenarios : Windows computers Linux/UNIX computers VMware computers Active Directory and Users Exchange Servers Endpoint Protection Server Lync Server Softwre ID (SWID) tags SQL Server SQL Server with Database Details Microsoft Azure Platform Migration Oracle Windows Volume Licensing Client Access Tracking for Windows Server 2012 or Later Client Access Tracking for SQL Server 2012 or later Client Access Tracking for Configuration Manager Client Access Tracking for SharePoint Server 2016 Client Access Tracking for Remote Desktop Services … and IT Admins can use below methods to discover the machines. Use Active Directory Domain Service (AD DS) Use Windows networking protocols Use System Center Configuration Manager (SCCM) Scan an IP Address range Manually enter comptuer