U.SAMYKANNU

IPv4 - Address Classes Internet Protocol hierarchy contains several classes of IP Addresses to be used efficiently in various situations as per the requirement of hosts per network. Broadly, the IPv4 Addressing system is divided into five classes of IP Addresses. All the five classes are identified by the first octet of IP Address. Internet Corporation for Assigned Names and Numbers is responsible for assigning IP addresses. The first octet referred here is the left most of all. The octets numbered as follows depicting dotted decimal notation of IP Address − The number of networks and the number of hosts per class can be derived by this formula − When calculating hosts' IP addresses, 2 IP addresses are decreased because they cannot be assigned to hosts, i.e. the first IP of a network is network number and the last IP is reserved for Broadcast IP. Class A Address The first bit of the first octet is always set to 0 (zero). Thus the first octet ranges from 1 – 127, i.e. Class A addres

IPv4 address class TechTarget Contributor An IPv4 address class is a categorical division of  internet protocol addresses  in IPv4-based routing. Separate IP classes are used for different types of  networks . Some are used for public internet-accessible IPs and  subnets , that is, those networks behind a  router  (as in classes A, B and C). As well, some classes are reserved by the Internet Engineering Task Force ( IETF ) and the Internet Assigned Numbers Authority ( IANA ) for specific purposes. These special ranges are used for  multicasting  of identical data to all computers on a network or subnet or for research (as in classes D, E). Within this notation, classes are mainly differentiated by the number of bits they have for the network and the number of bits used for hosts. IP addresses are notated in four groups of three-digit representations of 8 bits of  binary  in  base 10 -formatted notation for a total of 32 bits. The groups are separated by periods starting from zero (whic