IP Subnet Calculator

Calculate subnet details from IP address and CIDR prefix.

About IP Subnetting

IP subnetting is the practice of dividing a network into smaller subnetworks. It is essential for efficient IP address allocation, network security, and traffic management. CIDR (Classless Inter-Domain Routing) replaced the older classful system, allowing networks to be split with any prefix length from /0 to /32. This tool calculates network address, broadcast address, host ranges, subnet mask, wildcard mask, and IP class entirely in your browser.

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Frequently Asked Questions

What is a subnet?▾
A subnet (subnetwork) is a logical partition of an IP network. It divides a large network into smaller, manageable segments to improve performance and security.
What does CIDR notation mean?▾
CIDR (Classless Inter-Domain Routing) notation uses a slash followed by the number of network bits (e.g. /24). It replaces the older classful addressing system and allows flexible subnetting.
Is the calculation done locally?▾
Yes ? all subnet calculations happen entirely in your browser. No data is sent to any server.