The `cidrsubnet` function in Terraform enables efficient subnet allocation by programmatically dividing CIDR blocks without manual calculations. It helps streamline the process of managing IP addresses and reducing routing table sizes by enabling the aggregation of multiple IP networks. The function is ideal for infrastructure automation, especially in cloud networking, where subnet segmentation is frequently required. By using `cidrsubnet`, users can divide larger network ranges into smaller subnets, ensuring scalable and well-organized network architectures. This approach enhances security, optimizes resource allocation, improves network performance, enables high availability, and follows cloud-specific best practices. The function simplifies the process of managing large networks by automating IP allocation, reducing manual effort, and promoting consistent subnet sizing.