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So the answer to your question is Yes:
Can I delete and then create a new VPC with the same CIDR 172.31.0.0 or will this cause future issues?
If you delete your default VPC, you can create a new one. You cannot restore a previous default VPC that you deleted, and you cannot mark an existing non-default VPC as a default VPC.
Reference: https://docs.aws.amazon.com/vpc/latest/userguide/default-vpc.html#create-default-vpc
Is there a reason you want to use the default VPC? I'd highly encourage to move away from default VPC as it's not recommended and is a bad practice to use mainly for security reasons.
0
Go ahead and delete the default VPC. It's standard practice for us across all VPCs for all our clients and has never caused the slightest issue.
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Thank you for your reply. My main question is more related to the fact of deleting the default VPC, not using it. Should I keep the default VPC and just not use it? is there a recommendation about keeping the default VPC for something? I normally create a new VPC and work on it, but should I keep the default VPC?
You can go ahead and delete it, it wont cause any issues.