Which class of IP addresses includes the range 128 - 191?

The range of IP addresses from 128 to 191 falls under Class B addresses. Class B addresses are designed for medium to large networks and use the first two octets (the first 16 bits) for the network portion of the address, providing a larger number of available hosts than Class A but fewer than Class C.

Class B addresses start with a binary prefix of 10, which corresponds to the decimal range of 128 to 191. This classification allows for networks with a greater number of hosts because Class B can accommodate up to 65,534 hosts on each network.

Understanding the structure and purpose of different IP address classes is essential for effective network management and design, especially in determining how to allocate addresses based on the size and requirements of a network.