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I have a VPC created with a CIDR block of 10.10.0.0/16. I am trying to subnet that block into some /24's -- ie. 10.10.1.0/24

It wont let me. The error I get is: CIDR Address overlaps with existing Subnet CIDR: 10.10.0.0/16.

My understanding is that I should be able to create subnets within the VPC CIDR block as long as they are smaller than the block. I would expect /24 to fall within a /16.

Every subnet I've tried gives me the same error. In reality, any subnetting of a block is going to have addreses overlapping within the block.

I'm at a loss here and could really use some help.

1 Answer 1

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I found the problem...

When building the VPC, where you specify the subnet CIDR, I had also made it 10.10.0.0/16.

Changing it to 10.10.0.0/24 allowed me to create the subnets I needed.

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