You can query Active Directory to determine the schema version as shown below.  Replace “dc=domainname” with your information:

dsquery * cn=schema,cn=configuration,dc=domainname,dc=local -scope base -attr objectVersion

 

The PowerShell version below does not require any customization:

Get-ADObject (get-adrootdse).schemaNamingContext -Property objectVersion

 

The table below shows Active Directory schema versions.