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The subnets must each have at least six IP addresses for use by Amazon EKS. However, we recommend at least 16 IP addresses.
https://docs.aws.amazon.com/eks/latest/userguide/network_reqs.html
But remember that you will have nodes. They require much more IPs, especially when your env is scaled much
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in my terraform eks module, there are two fields:
I will provide the subnets for the nodes separately. So if I give /27 subnet to controlplane per zone, It should be enough?
/27 netmask = 32 IPs in general. In the case of AWS, it's 27 IPs available for allocation (because 5 IPs are booked by VPC), so 27 IPs should be enough