Classless Inter-Domain Routing (CIDR) is the primary IP addressing scheme used in modern networks. It enables network engineers to create subnets that encapsulate a range of IP addresses, facilitating efficient allocation of IPs in virtual private clouds (VPCs) and other networks. Datadog Log Management offers an intuitive syntax for CIDR queries, allowing users to search logs within a specific subnet by filtering on its corresponding CIDR block. This feature is useful in various scenarios such as troubleshooting network issues, monitoring security threats, and analyzing network performance. By using CIDR notation queries, users can identify traffic from unexpected sources, analyze network failures, and investigate network communication within a VPC.