The subnet calculator lets you enter a subnet range (CIDR) and see IP address information about that range. It also lists each IP address in the range and automatically does a Reverse IP Lookup for you. You can type your range directly in CIDR notation, or use the optional Mask pull-down:

  •, then select Optional Mask from dropdown
This is a useful feature for service providers and network operator who frequently allocate and work with subnets. 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.

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