IP Addressing:









Class A first octet range 1-127



(Network 127 is reserved for loopback and self testing) bit pattern 0xxxxxxx





Class B first octet range 128-191 bit pattern 10 xxxxxx





Class C first octet range 192-223 bit pattern 110 xxxxx





Class D first octet range 224-239 (Reserved for multicast) bit pattern 1110 xxxx





Class E first octet range 240-255 (Reserved for for research) bit pattern 11110 xxx









Maximum number of unique address in Class A 2^7 - 2 = 126





Class B 2^14 - 2 = 16,382





Class C 2^21 - 2 = 2,097,150









Formulas to determine the number of subnets:





M = the number of bits borrowed (Masked)

U = the number of bits remaining or not borrowed bits.





2^M = Total number of subnets created

2^U = Total number of host on each subnets





2^M - 2 = Usable number of subnet created





2^U - 2 = Usable number of host in each subnet









Class A:





Class B:

















Class C:









THANKS







