How many bits are there in an IPv6 address?

Correct answer: 128. An IPv6 address has 128 bits.

Background: IPv6 was created because IPv4 addresses were running out.

• 64: 64 is half of an IPv6 address.
• 24: 24 is not the size of an IPv6 address.
• 256: 256 is double the size of an IPv6 address.

Did you know? It is written in hexadecimal, such as 2001:db8::1.

Memory trick: IPv6 = 128 bits.