Is there a limit on how large or small a subnet can be?
子網路的大小是否有限制？
The minimum size of a subnet is a /28 (or 14 IP addresses.) for IPv4. Subnets cannot be larger than the VPC in which they are created.
For IPv6, the subnet size is fixed to be a /64. Only one IPv6 CIDR block can be allocated to a subnet.
針對 IPv4，子網路的大小下限為 /28 (或 14 個 IP 地址)。子網路不能大於建立這些子網路的 VPC。
針對 IPv6，子網路大小固定為 /64。一個子網路只能配置一個 IPv6 CIDR 區塊。