1. A class of service server for managing classification of objects in a directory service, comprising: a memory comprising rules associated with determining values representative of a category of class of service; and a processor communicatively coupled to the memory and operable to: identify an object listed in a directory service; receive classification information associated with the object from a reference database; access a rule that specifies a value that corresponds to the classification information, wherein the value is based on a power of two classification model; create a class of service attribute using the value; and associate the class of service attribute with the object listed in the directory service.