Reverse DNS (RDNS) -- 2013-2017 (2013-01-01 to 1905-07-09)

External Data Source
This dataset includes the responses to the IPv4 PTR lookups for all non-blacklisted/private IPv4 addresses. Please note that effective February 2017, this study has been deprecated in favor of https://opendata.rapid7.com/sonar.rdns_v2/ ; research@rapid7.com
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