On a side note, I recently discovered https://scans.io/ where you can find pretty much all of the data that I collected as well. Might be interesting.
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Censys (https://www.censys.io/) is also from them and it's a search frontend for a quick lookup in their data. It can come in real handy.
You might find the processing tips on the Project Sonar wiki useful:
https://github.com/rapid7/sonar/wiki/Analyzing-Datasets
Project Sonar is one of the primary contributors to scans.io. The DAP utility is handy for parsing raw x509 certificates and generating JSON output.