Advanced Placement (AP) Computer Science 2025 – 400 Free Practice Questions to Pass the Exam

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.