The report, “A Decade of Passive DNS” provides a longitudinal analysis of the use and popularity of top-level domains over a ten-year-period. The findings are based on what Farsight Security has seen in passive DNS from 2010-2019 based on a ten-year data rollup, excluding DNSSEC-related records. This study allows us to report on four measures for that period for each of the 1,576 IANA-recognized TLDs:
The total number of unique RRsets (unique combinations of RRname, RRtype, Rdata, Bailiwick, sensor or zone data): 130,780,406,614
The total number of unique fully qualified domain names (FQDNs) seen: 51,326,781,632
The total number of unique effective 2nd-level domains (or “delegation points”) seen: 1,071,823,976, and
The sum of counts, or total number of cache misses: 42,144,068,459,975.
Expectedly, the gTLD expansion added more nuisance than utility.
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