You can USE poweshell command for export AD machine details
Getting computer names from AD using Powershell
http://www.powershelladmin.com/wiki/Getting_computer_names_from_AD_using_Powershell
Csvde command
https://social.technet.microsoft.com/Forums/windowsserver/en-US/fbdd4027-e132-4c6b-ad6f-468944c2ce12/how-to-export-all-computer-list-with-operating-system-from-ad-and-all-attributes-like-disable-or?forum=winserverDS
In SEPM you can export computer status report and export all sep client installed host name
You can go to monitor --> logs - computer status report Export any report in csv
https://www-secure.symantec.com/connect/articles/how-export-virus-definition-and-client-information-excel-format