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 …

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 …

Feb 15, 2026 · Quick Definition (30–60 words) CIDR (Classless Inter-Domain Routing) is a compact notation for IP address ranges using a prefix and mask length. Analogy: CIDR is like using a ZIP+4 …

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.

CIDR (Classless Inter-Domain Routing) is a method for describing IP networks using a slash followed by a number. The number after the slash tells you how many bits are used for the network portion of the …

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 …

Sep 4, 2025 · CIDR notation is a modern, efficient way of representing IP addresses. Unlike outdated classful addressing, CIDR allows you to size networks exactly to your needs, minimize wasted …