AWS Availability Zone Subnetting

Hello All,

I’m new to cloud computing with Amazon and using Terraform to create my environment. I am trying to create two availability zones, each one with its own subnet. I am using an IP address of 10.0.0.0/16, which means that I should logically be able to use subnets with the following addresses:

10.0.3.0/24
10.0.4.0/24
10.0.5.0/24
10.0.6.0/24
10.0.7.0/24

However, when I do this I get errors when I run terraform apply. What am I doing wrong? Thanks for any assistance.