The size of an IPv4 address is
A16 bits
B32 bits ✓ Correct
C64 bits
D128 bits
Correct answer: (B) 32 bits
Explanation
An IPv4 address is 32 bits long, giving four eight-bit groups shown in dotted decimal.
16 bits would be too few to number today's hosts and is not the IPv4 size.
64 bits is not the length used by the IPv4 standard.
128 bits is actually the size of an IPv6 address, not IPv4.
The 32-bit space allows about 4.3 billion unique addresses.
Address exhaustion in IPv4 drove the move toward IPv6.
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