Network and VPC sizing 

When designing a VPC, we first need to look into network address configuration. Make sure that you design the network and subnet addressing with enough space to comfortably accommodate both the existing size and any future requirements for your application. The general rule when designing a VPC network and subnet ranges is that bigger is better. Don't lock yourself into small little subnets that will not allow your application to grow. Remember: once you create a VPC network, it cannot be changed. In case you require a larger network for your instances, you will need to create a new VPC and move the instances to the new VPC subnets.