Computer Science - Networking - Discussion


What is the first octet range for a class A IP address?

[A]. 1 - 126
[B]. 192 - 255
[C]. 192 - 223
[D]. 1 - 127
[E]. 128 - 191

Answer: Option A


No answer description available for this question.

Rathiga said: (Apr 12, 2014)  
Class A networks have a beginning octet of 1 - 126.
Class B networks have a beginning octet of 128-191.
Class C networks have a beginning octet of 192 - 223.

Notice a number missing? 127 is the reserved first octet for loopback addresses, such as the address assigned to a PC.

Class D networks are reserved for multicasting. Class D addresses begin with an octet in the 224 - 239 range.

Class E networks are reserved for "experimental use", and the first octet of these addresses is 240 - 255. Those addresses are reserved by the Internet Engineering Task Force (IETF). Neither Class D nor Class E networks should be assigned to host devices.

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