                    = 0xffffff  IN_CLASSA_MAX                        = 0x00  IN_CLASSA_NET                        = 0xff000000  IN_CLASSA_NSHIFT                     = 0x00  IN_CLASSB_HOST                       = 0xffff  IN_CLASSB_MAX                        = 0x00000  IN_CLASSB_NET                        = 0xffff0000  IN_CLASSB_NSHIFT                     = 0x00  IN_CLASSC_HOST                       = 0xff  IN_CLASSC_NET                        = 0xffffff00  IN_CLASSC_NSHIFT                  