Question

What is the total number of bits that comprise a single standard IPv4 (Internet Protocol version 4) address?

• A. 16 bits
• B. 32 bits
• C. 64 bits
• D. 128 bits

Hint:

IPv4 = 32 bits IPv6 = 128 bits Remember: IPv6 was introduced because IPv4 addresses became insufficient.

Answer 1

The Correct Option is B

Step 1: Understand the question.
We need the number of bits in a standard IPv4 address.

Step 2: IPv4 structure.
An IPv4 address has 32 bits. These are split into four groups of 8 bits called octets, like $192.168.1.1$.

Step 3: The range.
Each octet runs from 0 to 255, and IPv4 allows about $2^{32}$ addresses.

Step 4: Compare with IPv6.
IPv6 uses 128 bits, far more than IPv4's 32 bits. So 64 and 128 do not fit IPv4.

Step 5: Conclude.
An IPv4 address has 32 bits.

Answer: 32 bits