Hi, @Ramesh RK
Thank you for posting in Microsoft Q&A forum.
I think you are mentioning is the General Information in Summary tab of the device.
If the device haven't install client agent, the AD site is collected by AD System Discovery from AD DS, if the device have client agent installed, it will be collected by Heartbeat Discovery.
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.