Addresses of this class are reserved for future applications. Sequence 11110 at the beginning of the address specifies its belonging to class E. If the destination address is a class D address, then such a package is available to all nodes to which this address is assigned. It designates a special, group address which is called multicast. If the sequence 1110 is the beginning of the address, then this address belongs to class D. There are ranges of network numbers, as well as the maximum number of nodes corresponding to each class of networks: But such that the meanings of these first bits of the address are indications of which class a particular IP address belongs to.Ĭonsider the table below. The class system uses the value of the first bit of the address. It allows distinguishing which part of the IP address refers to the network number and the host number. The class system is used to more rationally define the size of the network. It is not necessary on an isolated network (i.e., not connected to the Internet). The first of them serves to identify a segment of the interconnected network, the second – to identify a specific node. Unique subnet IDs are created by splitting the host ID into two groups of bits. To subdivide a network into multiple subnets, you must use a different network ID for each segment. A subnet is a physical segment of a TCP / IP network that uses IP addresses with a common network identifier.
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