CREST Practitioner Security Analyst (CPSA) Practice

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What is the range of addresses for Class B?

0.0.0.0 - 127.255.255.255
128.0.0.0 - 191.255.0.0
192.0.0.0 - 223.255.255.0
224.0.0.0 - 239.255.255.255

The correct answer is: 128.0.0.0 - 191.255.0.0

The range of addresses for Class B is accurately defined as 128.0.0.0 to 191.255.0.0. This classification stems from the original designations of IP addresses which were allocated into specific classes based on their leading bits. A Class B address begins with a first octet in the range of 128 to 191, which corresponds to the binary representation starting with '10'. In this class, addresses are generally used for medium to large networks, allowing for a substantial number of host addresses (over 65,000) to be assigned to each network. This makes Class B suitable for organizations that require a significant number of devices on a single network segment. The other provided ranges correspond to different classes: Class A comprises addresses from 0.0.0.0 to 127.255.255.255, while Class C runs from 192.0.0.0 to 223.255.255.255. Class D (224.0.0.0 to 239.255.255.255) is reserved for multicast addresses, and Class E is used for experimental purposes. Understanding these classes helps in efficient IP address allocation and management within network infrastructures.