Advanced Placement (AP) Computer Science

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How many addresses can IPv4 support?

  1. Approximately 2 billion

  2. About 4 billion

  3. More than 7 billion

  4. Over 10 billion

The correct answer is: About 4 billion

IPv4, which stands for Internet Protocol version 4, utilizes a 32-bit address space. This means that it can generate 2^32 distinct addresses. Performing the calculation, 2 raised to the power of 32 equals 4,294,967,296. Thus, IPv4 can support approximately 4 billion unique IP addresses. Additionally, it's important to understand that some of these addresses are reserved for special purposes, such as private networks and multicast addresses, meaning that the total number of usable addresses for public internet hosts is slightly less. However, the theoretical limit remains around 4 billion, making this the correct answer.

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