CIDR (Classless Inter-Domain Routing) is a method for allocating IP addresses and routing that replaces the old classful system. It uses notation like 192.168.1.0/24.

How do I calculate a subnet?

Enter a CIDR notation (e.g., 192.168.1.0/24) into the calculator. It will show the network range, broadcast address, netmask, and number of usable IPs.

Free Subnet & CIDR Calculator — IP Range, Netmask, Broadcast

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