cloud-engineering

CIDR

Classless Inter-Domain Routing

Definition

CIDR is a method for allocating IP addresses and routing by using a prefix notation (e.g., 10.0.0.0/16) that specifies the network address and the number of bits used for the network portion. CIDR notation determines how many hosts a subnet can contain and governs routing table entries.

Proper CIDR planning in VPCs avoids address space exhaustion and enables VPC peering without overlap.

Related Terms

Subnet

Virtual Private Cloud Subnet

VPC

Virtual Private Cloud

Route Table

NAT Gateway

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