Source: Microsoft Internal

Do you want to know to which agents report to a specific Management Server? Just execute the next code in your OpsMgr Command Shell.

Function GetSpecificAgents ([string]$managementserver)

{

  write-host ""

  write-host "The following servers have $managementserver as their primary management server:"

  FOREACH ($i in get-agent)

  {   

    IF ($i.PrimaryManagementServerName -eq $managementServer)

    {

      write-host  $i.name

    }

  }

  write-host ""

}

GetSpecificAgents "<FQDN of management server>"

Disclaimer

This sample is not supported under any Microsoft standard support program or service. This sample is provided AS IS without warranty of any kind. Microsoft further disclaims all implied warranties including, without limitation, any implied warranties of merchantability or of fitness for a particular purpose. The entire risk arising out of the use or performance of this sample and documentation remains with you. In no event shall Microsoft, its authors, or anyone else involved in the creation, production, or delivery of this sample be liable for any damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information, or other pecuniary loss) arising out of the use of or inability to use this sample or documentation, even if Microsoft has been advised of the possibility of such damages.