IP Addressing and Classes

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IP – Internet Protocol

IP or IP address is a number i.e. ( 216.58.216.165 ) used to indicate the location of a computer or other device on a network.

IP address classes

IPv4 IP address, there are five classes of available IP ranges:
Class A
Class B
Class C
Class D
Class E

Only A, B, C are commonly used.

Each class has its range of valid IP addresses are shown below :

Class Address Range  Supports
 Class A  1.0.0.1 to 126.255.255.254  Supports 16 million hosts on each of 127 networks.
 Class B  128.1.0.1 to 191.255.255.254  Supports 65,000 hosts on each of 16,000 networks.
 Class C  192.0.1.1 to 223.255.254.254  Supports 254 hosts on each of 2 million networks.
 Class D 224.0.0.0 to 239.255.255.255  Reserved for multicast groups.
 Class E 240.0.0.0 to 254.255.255.254  Reserved for future use, or Research and Development Purposes.

Range from 127.0.0.0 are reserved for the loopback or localhost i.e. 127.0.0.1

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