Our company (Gamador) is listed as hosting from "Global Net Access LLC" which I had never heard of - we just use Linode. So there might be some Linode undercounting going on.
Comments, ideas, bugs and patches welcome. The program I used to generate the report is hosted on GitHub here: https://github.com/jpf/domain-profiler/
This is mostly thanks to the suggestion from HN user jedsmith. I've updated my script to incorporate what should be a more accurate way of determining the name of an organization that owns a particular IP address.