Classless Inter-Domain Routing (CIDR pronounced "cider" or / ˈsɪdər / SID-ər) is a method for allocating IP addresses for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace …

CIDR stands for Classless Inter-Domain Routing, and refers to the standard of dividing the entire IP address space into smaller networks of variable size.

Classless Inter-Domain Routing (CIDR) allows network routers to route data packets to the respective device based on the indicated subnet. Instead of classifying the IP address based on classes, …

CIDR is the short for Classless Inter-Domain Routing, an IP addressing scheme that replaces the older system based on classes A, B, and C. A single IP address can be used to designate many unique IP …

Jan 10, 2026 · CIDR (Classless Inter Domain Routing) is a method of IP address allocation and routing that allows more efficient use of IP addresses. Unlike traditional class-based addressing, CIDR …

Oct 23, 2025 · CIDR is a tool that maximizes network routing efficiency via subnetting, supernetting, and a simplified IP address notation. Classless inter-domain routing (CIDR) is a method of internet …

Jun 1, 2025 · Try our free subnet calculator to practice these CIDR concepts with real calculations, or dive deeper with our AWS VPC subnetting guide to see how CIDR works in cloud environments.

Classless inter-domain routing (CIDR) is a set of Internet Protocol (IP) standards that is used to create unique identifiers for networks and individual devices. The IP addresses allow particular information …

Jun 13, 2024 · CIDR (Classless Inter-Domain Routing or supernetting) is a method of assigning IP addresses that improves the efficiency of address distribution and replaces the previous system …

CIDR—short for Classless Inter-Domain Routing —is the notation system used to define IP address ranges in today’s internet infrastructure. CIDR has been a foundational part of IP networking since …