Have a VPC using a 10.1.0.0/16

Question

I am unable to create a series of subnets using this IP config  
10.1.1.0/24  
10.1.2.0/24  
10.1.3.0/24  
10.1.4.0/24  
  
I get the same usual error that it conflicts with the CIDR... any suggestion?  
  
I have other vpcs that have a 10.0.0.0/16  
I am unable to create subnets   
10.0.1.0/24  
10.0.2.0/24  
10.0.3.0/24  
10.0.4.0/24  
  
Created more vpcs and am unable to solve any of these issues to create 4 subnets, I need to create  more subnets as I have a 65K number of IPs available I believe.  
Thanks

Accepted Answer

Hi  
Something to check.  
On the VPC Console, check your Subnets tab to make sure they are as expected. My guess is that  10.0.0.0/16 exists in a VPC somewhere and has been sliced into 3 subnets of /20 already and probably conflict with your attempts to allocate those subnets.   
If using the AWS CLI, try **aws ec2 describe-subnets -text**   and check the output for the same.  
  
Or follow this guide to create a new VPC with new subnets and you should get your outcome. (Try it in a new region to test it out if you want).  
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/getting-started-ipv4.html  
HTH

Have a VPC using a 10.1.0.0/16

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