According to one embodiment of the present invention, classification of objects in a directory service may be managed. An object is identified in a directory service. Classification information associated with the object is received from a reference database. Using a processor, a rule that specifies a value that corresponds to the classification information is accessed. The accessed value is based on a power of two classification model. Using the processor, the class of service attribute is created using the value. The class of service attribute is associated with the object listed in the directory service using the processor.