serviceIpv4Cidr property
The CIDR block that Kubernetes service IP addresses are assigned from. If you didn't specify a CIDR block when you created the cluster, then Kubernetes assigns addresses from either the 10.100.0.0/16 or 172.20.0.0/16 CIDR blocks. If this was specified, then it was specified when the cluster was created and it cannot be changed.
Implementation
final String? serviceIpv4Cidr;