After creating VPC using standard private IP address and their subnets in Alibaba Cloud VPC.
The standard IP address ranges include 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 and the default is 172.16.0.0/12.
I am not able to modify CIDR Block
I appreciate any assistance with this.
It is not possible to change the vpc cidr block after creation.
See the documentation link https://www.alibabacloud.com/help/doc-detail/65430.htm
You need to create the new VPC with new CIDR range.