TCP/IP addresses in the current version most heavily used today are how many bits long?

In the current version of TCP/IP that is most widely used today, which is IPv4, addresses are designed to be 32 bits long. This 32-bit structure allows for a total of approximately 4.3 billion unique addresses (2^32). Each address is typically represented in decimal as four octets, separated by periods (e.g., 192.168.1.1), where each octet consists of 8 bits.

IPv4 has been the foundational protocol for internet addressing, facilitating the global connectivity we see today. Although IPv6 was introduced to address the limitations of IPv4, such as the exhaustion of available addresses, it utilizes a 128-bit address space. However, the question specifies the most heavily used version today, which remains IPv4 with its 32-bit addresses.

In contrast, the other options present shorter and longer address lengths that are not applicable to the primary version of TCP/IP in widespread use.