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Re:Show HN: Open-source search engine with 2bn-page index by webtechgal on Tuesday September 13, 2016 @12:17PM (#12489670)
> Run your own DNS server and even cache the hostname/IP pairs yourself.

This[1] might be a useful resource to get started:

[1] https://scans.io/

(Register and download the IPv4 Address Space data file to use as an initial cache and then append/update as you go.)

Re:Show HN: Open-source search engine with 2bn-page index by deusu on Tuesday September 13, 2016 @01:00PM (#12490138)
Bookmarked. Thanks!