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Subnet Sizing for VPC IPv6

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The CIDR block uses a fixed prefix length of /56. Amazon assigns a range of block to the VPC from its pool of IPv6 addresses, but you cannot choose the block for your VPC.

A subnet's IPv6 CIDR block uses a fixed prefix length of /64. For subnet, you can assign an IPv6 CIDR block.

Example: Amazon assigns the following IPv6 CIDR block to your VPC: 2001:db8:1234:1a00::/56. You can create a subnet and associate an IPv6 CIDR block from this range such as 2001:db8:1234:1a00::/64.

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