ggsava/block-this : Block This - FREE DNS based Ad Blocker for Android
▻https://github.com/ggsava/block-this

Block This is a DNS/VPN based ad blocking & privacy app for Android, that blocks malicious or unwanted internet content by filtering DNS requests and redirecting them to 127.0.0.1 (localhost). It uses a dummy VPN client in order to go around the restrictions in Android and change the DNS settings without having root access. The backend behind the app is a DNS based on PowerDNS - an open source DNS management software working with MySQL as a datasource.