In case anyone is looking at this post all these years later, here is a tool you can use in ArcGIS Pro to identify areas of your network dataset that are topologically disconnected from one another:
https://www.arcgis.com/home/item.html?id=b2227f745a6c4e1c94dd57810729d2a9
It is not as comprehensive as the Idea posted here, and we hope to improve offerings in this area one day.
This idea has been closed as a duplicate of the Data Management Idea linked below. Don't worry, you can still show your support by commenting and adding kudos to the open idea. Thanks for your contributions!
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