Reverse DNS (RDNS) data lists the domain names for all public IPv4 addresses.
The ANT project first collected RDNS data in 2013, and we are currently in the process of collecting such data. We expect to provide periodic snapshots of the IPv4 RDNS tree.
Each file is in Fsdb format, a tab-separated text format with # comments. The schema is:
#fsdb -F t block hexip ip answer authority 01000400 01000400 18.104.22.168 ip1.ip0.ip4.ip0.reverse.bigredgroup.net.au. - 01000400 01000401 22.214.171.124 loop0.brg_mel01_7206.bigredgroup.net.au. -
Each file is sorted by hexip.
See our datasets request page for details about how to get these datasets.
Our current RDNS crawling software is available.