What is the size of an IPv4 address?

The size of an IPv4 address is 32 bits.

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#In short, for an interview

An IPv4 address has a length of 32 bits (4 bytes).

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#A little more detail, simply

#What this looks like in practice

32 bits = 4 bytes, so an IPv4 address is written as:

192.168.1.10

• 4 numbers
• each number is 1 byte (8 bits)
• the range of each number: 0-255

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#What is important to remember

• IPv4:
  • a logical address
  • used at the network layer
• Total possible IPv4 addresses:
  • 2³² ≈ 4.3 billion

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#For comparison