DNS-Based Host Blocking for Android Based on DNS66, this projects aims to continue the goals of the original app with modern Android development practices. This is a DNS-based host blocker for Android. In the default configuration, several widely-respected host files are used to block ads, malware, and other weird stuff. Using it There's also no validation of input, so DNS servers that are not valid IPv4 addresses are not rejected, neither are URLs for DNS server entries (we intend to support URLs in the future, so you can point the app to a remote list of servers). How it works The app establishes a VPN service, with routes for all DNS servers diverted to it. The VPN service then intercepts the packages for the servers and forwards any DNS queries that are not blacklisted. Custom upstream DNS can be configured. If the feature is turned off, the current connection's DNS servers are used.