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 and indicates that the object is associated with a first selection in a classification category; create a class of service attribute using the value; associate the class of service attribute with the object listed in the directory service; determine that the object is associated with a second selection in the classification category; identify a second value that is a power of two that is associated with the second selection in the classification category; calculate the sum of the value and the second value; and use the calculated sum as part of the class of service attribute.