What is one main reason cidr is helpful in modern networking?

CIDR (Classless Inter-Domain Routing) is incredibly helpful in modern networking primarily because it addresses the issue of <a href="https://www.wikiwhat.page/kavramlar/IP%20address%20exhaustion">IP address exhaustion</a>. By allowing for more flexible allocation of IP addresses compared to the older classful networking system, CIDR enables the creation of subnets of varying sizes. This means that network administrators can allocate IP address blocks that are much more precisely tailored to the needs of their organizations, avoiding the waste of large blocks of addresses. For example, instead of being forced to allocate a whole Class B network even if only 500 hosts are needed, a CIDR block of /23 can be used. This greatly improves the <a href="https://www.wikiwhat.page/kavramlar/efficiency">efficiency</a> of IP address utilization and slows down the depletion of available IP addresses, especially IPv4 addresses. Furthermore, CIDR simplifies <a href="https://www.wikiwhat.page/kavramlar/routing">routing</a> by enabling route aggregation, which reduces the size of routing tables.