Towards validation of the Internet Census 2012

The reliability of the ``Internet Census 2012'' (IC), an anonymously published scan of the entire IPv4 address space, is not a priori clear. As a step towards validation of this dataset, we compare it to logged reference data on a /16 network, and present an approach to systematically handle uncertainties in timestamps in the IC and reference data. We find evidence the scan indeed took place, and a 93\% match with the /16 reference data.