[lotsofpulp]

It is pretty inaccurate in my experience. When I was house hunting, I learned to simply put each address in the ISP website.

Even now, I put my zip code in, and it says 940Mbps fiber available, with an asterisk that says it may not be available everywhere. Except I know in my zip code, 95% of the houses do not have fiber, only the developments built in the last decade or so.

And as a shortcut, any neighborhood with buried utilities developed between 1980 to ~2010 will likely not have fiber.

[toomuchtodo]

Even the ISP positively indicating service does not necessarily mean you have service; tech can roll out and say you need to spend tens of thousands of dollars to make it from the premises to the neighborhood node.