IPv4 Reverse DNS data

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.

Some datasets:

Datatset Format

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 ip1.ip0.ip4.ip0.reverse.bigredgroup.net.au.     -
 01000400        01000401 loop0.brg_mel01_7206.bigredgroup.net.au.        -

Each file is sorted by hexip.

Getting this data

See requests.html for details about how to get these datasets.


Our current RDNS crawling software is available.