What is the 1st Octet value range for a Class B IP Address?

The range for the first octet in a Class B IP address is indeed 128 to 191. Class B addresses are designated for medium to large-sized networks and are identified by this specific range of the first octet.

Class B addresses are structured to support a larger number of hosts per network compared to Class A addresses. The first octet value of 128 indicates the start of the Class B allocation, while 191 marks the end of that class. This class allows for networks with a significant number of host addresses, as each Class B network can typically support up to 65,534 hosts.

Understanding the distinctions between IP address classes is essential for IP networking and managing address allocation effectively. The other ranges provided in the options correspond to different classes: Class A (1-127), Class C (192-223), and Class D (224-239), which serves for multicast purposes, making it important to recognize each class's specific range for proper network configuration and management.