Subnet Calculation Details
Binary Visualization
How to Use IP Subnet Calculator
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1. Enter an IP Address
Type an IPv4 address into the IP Address field (e.g. 192.168.1.100).
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2. Select a Subnet Mask
Choose a subnet mask from the dropdown or enter a CIDR prefix length directly.
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3. Review Subnet Details
See the network address, broadcast address, usable host range, total host count, and binary visualization.
The Technical Details
This interactive web utility provides fast, reliable, and completely private data transformations. In modern workflows, quick formatting, conversions, or estimations are essential. By running all logic entirely in your browser with client-side JavaScript, this tool guarantees that your data never leaves your machine. This approach delivers maximum performance and absolute data privacy, as no information is ever sent to a server.
Frequently Asked Questions
What is a subnet mask?
A subnet mask separates the network and host portions of an IP address. For example, 255.255.255.0 (/24) means the first 24 bits identify the network and the remaining 8 bits identify individual hosts.
How many usable hosts are in a /24 subnet?
A /24 subnet has 256 total addresses. The first (network address) and last (broadcast address) are reserved, leaving 254 usable host addresses.
What is the difference between a network address and a broadcast address?
The network address is the first IP in the subnet and identifies the network itself. The broadcast address is the last IP and is used to send data to all hosts in the subnet simultaneously.
Is this tool accurate for real-world network planning?
Yes. It uses standard IPv4 subnetting formulas to calculate all values, making it suitable for network design, troubleshooting, and certification exam study.