Explain CIDR blocks in AWS

Question

While providing IP for VPC and subnets, I could see a term called the CIDR block. Please explain what is CIDR block in AWS.

Answer 1

CIDR blocks the initial sequence of bits using the binary representation of their IP addresses. These IPv4 CIDR blocks can be found using a similar syntax to the IPv4 addresses: a dotted-decimal address, number from 0-32 followed by a slash like a.b.c.d/n.

Here, it is considered to be a fixed prefix of length /56. It allows you to request IPv6 CIDR block out of the IPv6 addresses. You can create a new subnet or use an existing subnet of your VPC by associating the IPv6 CIDR block.

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