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Convert between CIDR notation and subnet masks. Enter either a CIDR prefix or subnet mask to get the equivalent.
Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and routing Internet Protocol packets. CIDR notation represents an IP address and its associated network prefix, written as an IP address followed by a slash and the number of network bits.
Traditional subnet masks (like 255.255.255.0) can be converted to CIDR notation:
CIDR notation is more compact and flexible, allowing for variable-length subnet masking (VLSM).
Enter either a CIDR prefix (like /24) or a subnet mask (like 255.255.255.0) in the input field. The calculator will show you the equivalent notation and additional network information.