CIDR (Classless Inter-Domain Routing) is an IP addressing scheme that improves the efficiency of address space utilization. It replaces the older classful network addressing architecture. CIDR allows for more flexible allocation of IP addresses by using variable-length subnet masking (VLSM) to create subnets of arbitrary size. It's commonly used by Internet Service Providers (ISPs) and network administrators to allocate IP addresses and create subnets within their networks.
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