+/*
+ * Definitions of bits in internet address integers.
+ */
+#define IN_CLASSA(i) ((((long)(i))&0x80000000)==0)
+#define IN_CLASSA_NET 0xff000000
+#define IN_CLASSA_NSHIFT 24
+#define IN_CLASSA_HOST 0x00ffffff
+
+#define IN_CLASSB(i) ((((long)(i))&0xc0000000)==0x80000000)
+#define IN_CLASSB_NET 0xffff0000
+#define IN_CLASSB_NSHIFT 16
+#define IN_CLASSB_HOST 0x0000ffff
+
+#define IN_CLASSC(i) ((((long)(i))&0xc0000000)==0xc0000000)
+#define IN_CLASSC_NET 0xffffff00
+#define IN_CLASSC_NSHIFT 8
+#define IN_CLASSC_HOST 0x000000ff
+
+#define INADDR_ANY 0x00000000
+