The operational attributes contained in an entry can be returned by ldapsearch by:

Explicitly listing them

ldapsearch -x -h host:port -b c=au "(oc=*)" createTimestamp modifyTimestamp

Or by returning all of them with the special + character

ldapsearch -x -h host:port -b c=au "(oc=*)" +

Or all attributes including operational attributes can be returned by including "*" +

ldapsearch -x -h host:port -b c=au "(oc=*)" "*" +