Check-SchemaVersionOnEveryDomainController.ps1

$schemaContext = Get-ADRootDSE | %{$_.schemaNamingContext}

Foreach ($dc in ([System.DirectoryServices.ActiveDirectory.DomainController]::findall(
(new-object System.DirectoryServices.ActiveDirectory.DirectoryContext("Domain",$env:USERDNSDOMAIN)))) |
%{$_.name})
{
  $path = ‘LDAP://’ + $dc + ‘/’ + $schemaContext
  $Object = [adsi]$path
  $dc + ‘ ‘ + $Object.objectversion
}