Find Free IP Blocks Instantly – The Visual IPv4 Subnet Calculator

Managing IP address space shouldn’t be a headache. That’s why we built this Free IP Block Finder – a tool that helps you instantly see which IPv4 subnets are still available in your network, no matter how complex your allocations get. Whether you’re a network engineer, a sysadmin, or just someone who wants to keep their address space organized, this tool is designed to make your life easier.

Here’s how it works: just type in your parent CIDR block (for example, 192.168.0.0/22) and paste in any subnets you’ve already used. The tool does the rest, showing you a clear, visual map of what’s free and what’s taken. You don’t need to worry about subnet math or overlapping ranges – everything is automatically normalized to the correct network boundaries, so you get accurate results every time.

We know that network planning can get messy, especially as your organization grows. That’s why this tool is fast, visual, and totally free. You can export your results as a PDF or CSV, making it easy to document your work or share with your team. And because it works with any IPv4 range – public or private, big or small – it’s perfect for everything from cloud migrations to classroom labs.

Give it a try and see how much easier subnet management can be. No more spreadsheets, no more guesswork – just clarity.