How long are IPv4 addresses?

The correct answer is A. 32 bits long. IPv4 addresses are 32 bits (4 bytes) long, expressed as four 8-bit octets in dotted-decimal notation (e.g., 192.168.1.1). This gives a theoretical address space of about 4.3 billion addresses. IPv6 was introduced to address IPv4 exhaustion and uses 128-bit addresses (C). 64-bit…

Submitted by dimitri_ru· Apr 18, 2026Network and Communications Security

Question

Options

A32 bits long.
B64 bits long.
C128 bits long.
D16 bits long.

How the community answered

(35 responses)

A
89% (31)
B
3% (1)
C
6% (2)
D
3% (1)

Explanation

IPv4 addresses are 32 bits (4 bytes) long, expressed as four 8-bit octets in dotted-decimal notation (e.g., 192.168.1.1). This gives a theoretical address space of about 4.3 billion addresses. IPv6 was introduced to address IPv4 exhaustion and uses 128-bit addresses (C). 64-bit (B) and 16-bit (D) address lengths do not correspond to any standard IP version.

Topics

#IPv4 addressing#Network protocols#Network fundamentals#TCP/IP

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