https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/5aa09c90-c5db-4e97-98d0-b7cdd6bc1bfe
[MS-ADTS]: Foreign Security Principals Container | Microsoft Learn
In AD DS, each domain NC contains a well-known Foreign Security Principals container. This container holds objects of
foreign security principalsmsadtscontainermicrosoft