DeugNietS is a filtering DNS forwarder.
Note: TEST VERSION - USE AT OWN RISK!
Docker: https://hub.docker.com/r/cbuijs/deugniets
References/Inspiration:
https://github.com/supriyo-biswas/adblock-dns-server
https://github.com/dnaeon/py-vconnector/blob/master/src/vconnector/cache.py
https://www.reddit.com/r/Python/comments/2uik3q/expiring_inmemory_cache_module/
https://www.bortzmeyer.org/hackathon-ietf-101.html
This product includes the use of GeoLite2 data created by MaxMind, available from https://www.maxmind.com