CIDR Subnet Calculator
Calculate IP networks, subnets, broadcast addresses, and routing boundaries instantly.
Enter a valid IP and Prefix to view metrics.
About This Tool
The CIDR Subnet Calculator is a crucial utility designed for network administrators, IT engineers, and software developers building infrastructure. Classless Inter-Domain Routing (CIDR) notation allows for efficient allocation of IP addresses, but calculating the exact boundaries of a given subnet manually can be tedious and error-prone. This tool instantly reverse-engineers a CIDR string (like 192.168.1.0/24) into critical data points: the subnet mask, network address, broadcast address, and the complete usable host IP range. It runs entirely on your device with no API payloads meaning your proprietary network topology is secure and private.
How to Use
- Enter any valid IPv4 address mapped to a prefix size (e.g.,
10.0.0.0/16) in the provided IP input field. - Conversely, enter an IP address and adjust the slider to manually select a subnet mask from
/1to/32. - The network details card will instantly update showing network boundary information.
- You can copy any returned value exactly to map out cloud deployments or infrastructure routing.
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