I've been tasked with doing a network diagram of our offices (8 in total) across two different cities. Our network is all on a single flat subnet (10.1.X.X / 255.0.0.0) and all sites are connected ...

Sadly, this tool was removed some time ago. Even so, it is possible to create a detailed network diagram using only Windows 11 and Microsoft Office (including tools such as Excel and Visio).

If you are not familiar with Visio, it's used for creating diagrams such as flow charts and network diagrams. What I didn't realize is that you can actually create Visio diagrams from within Excel.