What is the valid number range for the first octet of a Clas

What is the valid number range for the first octet of a Class B network?

A. 0–126

B. 127–191

C. 128–191

D. 128–192

E. 192–223

Solution

An IP address which belongs to class B has the first two bits in the first octet set to 10,

10 000000 - 10 111111 --> 128 - 191

Class B IP Addresses range from 128.0.x.x to 191.255.x.x.

Answer : C