Hopefully you find these subnet tools useful. I've been doing networking for quite a few years and these are the tasks I've struggled with in the past.  IPv6 route summarization, overlapping prefixes, carving up address space.  Tedious tasks where simple mistakes are easy to miss.

The logo is 1 square, 2 dots and 4 circles.  Powers of 2 are the secret sauce in IP address space.  Moving a subnet mask by one bit doubles the size of a subnet.

The online tools are completely free. There are no distracting adds to support the costs of running the website. It just runs on coffee.

I greatly appreciate help with the coffee, but also any suggestions you might have to make the tools more useful, easier to use, and more effective. 

Thanks to you for your support