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Network Tool

Subnet Calculator

Calculate subnet details, CIDR notation, and host ranges from any IP address or CIDR block instantly.

Using the Subnet Calculator

Subnetting is a fundamental networking skill used to divide a large network into smaller, manageable segments. This CIDR calculator provides an instant breakdown of any network address, showing you the broadcast address, the range of usable host IPs, and the binary representation of your subnet mask.

How it Works

1
Enter your base IP address (e.g., 10.0.0.0).
2
Select the subnet mask or CIDR prefix (e.g., /24 or 255.255.255.0).
3
Review the "Network Address" and "Broadcast Address".
4
Check the "Max Hosts" field to see how many devices the subnet can support.

Technical Formula

Number of Hosts = 2^(32-n) - 2

Where n is the CIDR prefix length.

Frequently Asked Questions

What is CIDR notation?

CIDR expresses an IP address and its network prefix length, e.g., 192.168.1.0/24 means the first 24 bits are the network part.