Powershell to Query Active directory and get the list of Domain controllers in the current AD Site which you server is located

%{[System.DirectoryServices.ActiveDirectory.ActiveDirectorySite]::GetComputerSite().Servers | % { $_.Name} }

Powershell to Query Active directory to get the current AD sites

 [System.DirectoryServices.ActiveDirectory.ActiveDirectorySite]::GetComputerSite().name