IN_CLASSB         256 include/uapi/linux/in.h #define	IN_CLASSB(a)		((((long int) (a)) & 0xc0000000) == 0x80000000)
IN_CLASSB         256 tools/include/uapi/linux/in.h #define	IN_CLASSB(a)		((((long int) (a)) & 0xc0000000) == 0x80000000)