CIDRbased

CIDRbased denotes configurations, systems, or tools that employ CIDR (Classless Inter-Domain Routing) addressing. CIDR replaces classful addressing by allowing networks to be defined using a prefix length rather than fixed classes. In IPv4, networks are expressed with slash notation such as 192.0.2.0/24, and in IPv6 with forms like 2001:db8::/32. CIDRbased approaches enable more flexible allocation of address space and more scalable routing.

In CIDRbased schemes, an IP network is identified by a network address and a prefix length. The prefix specifies the number of leading bits that identify the network; the remaining bits designate hosts within that network. Routing decisions use the longest-prefix match, and CIDR supports route aggregation (supernetting) to combine multiple networks into a single entry, reducing the size of routing tables and improving scalability.

CIDRbased methods are common in routers, firewalls, and network services. They underpin BGP route announcements, access control lists, and subnetting plans, allowing variable-length subnets aligned to actual host counts. This flexibility helps conserve address space and supports scalable deployment for both IPv4 and IPv6 networks. The concept and its notation are described in relevant standards, such as IPv4 CIDR in RFC 1519 and IPv6 addressing and prefixes in RFC 4291.

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