Subnet Calculator

Given an IPv4 address and CIDR prefix length, calculate the subnet mask, network address, broadcast address, and number of usable hosts.

Inputs
Results
Network Address
192.168.1.0
Broadcast Address
192.168.1.255
Subnet Mask
255.255.255.0
Total Addresses
256
Usable Hosts
254

Try an example

Formula

Network = IP AND Mask; Broadcast = Network OR (NOT Mask)

Learn How This Works

Understanding IP Subnetting and Network Math

How subnet masks, CIDR notation, and usable host counts are calculated, with a real subnetting example.

IP Subnetting Explained With a Real /24 Example

How network address, broadcast address, and usable host count are calculated from an IP and CIDR prefix.

File Transfer Time and Network Throughput Explained

Why file transfer times need a bits-to-bytes conversion, and how real network throughput differs from the advertised link speed.

Setting Up a Home Network: Subnetting, Wi-Fi Throughput, and Real Transfer Times

How subnet planning, real-world Wi-Fi throughput after overhead, and file transfer time calculations connect for a home network setup.

Frequently Asked Questions

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