The probably is likely that the subnet has not been specified. The netloc_reader_ib is not terribly user friendly at the moment. We have some supporting tools that help make it easier to use. I highlighted the steps for another user in the mail linked below:
Notice that it does not call netloc_reader_ib explicitly, it is wrapped up as part of the netloc-ib-extract-dats script.
You will also need to install Jansson (if you have not already) as that is how netloc is currently representing the data (it may change in the future, but this works well for now). It can be downloaded from:
I am currently working on some FAQs to hopefully help answer these types of questions in the future. In the mean time feel free to email and we can go from there.