About Subnet Calculator
Use this subnet calculator to break down an IPv4 CIDR block into network, host, and mask details.
Calculate network, broadcast, host range, and mask details for IPv4 CIDR blocks.
Free Network Tool
Subnet Calculator
Calculate network, broadcast, host range, and mask details for IPv4 CIDR blocks.
Examples
Enter a value above and run the lookup.
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Subnet Calculator FAQ
What does a subnet calculator do?
A subnet calculator shows the network address, broadcast address, host range, subnet mask, and address counts for a CIDR block.
Why use CIDR notation?
CIDR is the standard compact format for representing a network block and prefix length.