IP address - (3)

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Internet Protocol Address
(IP address) - 3 


Summary on What we have studied in last Tutorial ? :-

  • class A  will have 224 -2 = 16,777,214 number of host (IP) addresses available to assign to the devices except for two reserved host addresses in each network.
  • Reserved host addresses are one for network address and another for broadcast address. First byte of Class A specifies Decimal Values from 0 to 127. 
  • Class B will have 216 - 2 = 65,534 number of host (IP) addresses available to assign to the devices.
  • Class B provides 16 reserved network address blocks for private addresses. Hence, the remaining 16,368 network address blocks are used for assigning address to various organisations.

(2.3) Class C IP Addressing :-


      Class C addresses consists of 24-bit network ID and 8-bit host ID; as show in the figure below :-

Class C IP address Structure

      So, each network in Class C will have 28 - 2 = 254 number of host IP addresses available to be assigned to the deices. Class C address class supports 2,097,152 network blocks. 

      The first network block starts from 192.0.0.0 to 192.0.0.255. The last network block in Class C starts from 223.255.255.0 to 223.255.255.255 where network ID is 223.255.255.x. The Network ID field is represented by first three bytes, 192.0.0.x.
      
      Class C provides 256 network blocks which are reserved for private addresses. The remaining 2,096,896 network blocks are used for public use. Each block of Class C address provides 256 host addresses. Within host addresses in each network block, designed to serve IP address to smaller organisations.


Note :-
      First byte of class C specifies decimal values from 192 to 223.

(2.4) Class D IP Addressing :-


      Class D address class is designed for Multicasting. Each address in this Class defines a particular group of hosts over the Internet. This Class of address consist of only one block of address. When a group of computers are assigned an address from this class each Host within the group has a multicast address in addition to its normal address. First byte of Class D specifies decimal values from 224 to 239.

(2.5) Class E IP Addressing :-


      Class E address is reserved for future and experimental use. First byte of class E specifies decimal values from 240 to 255.

      The selection of Class is mostly based on the number of hosts required by the organization as given in the table below :-


Address Classes

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