ADSystemInfo.ps1

function Get-ADSystemInfo{ 
    <# 
        .LINK 
            https://technet.microsoft.com/en-us/library/ee198776.aspx 
    #> 
        $properties = @( 
            'UserName', 
            'ComputerName', 
            'SiteName', 
            'DomainShortName', 
            'DomainDNSName', 
            'ForestDNSName', 
            'PDCRoleOwner', 
            'SchemaRoleOwner', 
            'IsNativeMode' 
        ) 
        $ads = New-Object -ComObject ADSystemInfo 
        $type = $ads.GetType() 
        $hash = @{} 
        
        foreach($p in $properties){ 
            $hash.Add($p,$type.InvokeMember($p,'GetProperty', $Null, $ads, $Null)) 
        }

        [pscustomobject]$hash 
}