publicAccessCidrs

The CIDR blocks that are allowed access to your cluster's public Kubernetes API server endpoint. Communication to the endpoint from addresses outside of the CIDR blocks that you specify is denied. The default value is 0.0.0.0/0 and additionally ::/0 for dual-stack IPv6 clusters. If you've disabled private endpoint access, make sure that you specify the necessary CIDR blocks for every node and Fargate Pod in the cluster. For more information, see Cluster API server endpoint in the Amazon EKS User Guide.

Note that the public endpoints are dual-stack for only IPv6 clusters that are made after October 2024. You can't add IPv6 CIDR blocks to IPv4 clusters or IPv6 clusters that were made before October 2024.