Programming language: Go
License: Apache License 2.0

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Blocky is a DNS proxy and ad-blocker for the local network written in Go with following features:


  • Blocking - Blocking of DNS queries with external lists (Ad-block, malware) and whitelisting

    • Definition of black and white lists per client group (Kids, Smart home devices, etc.)
    • Periodical reload of external black and white lists
    • Regex support
    • Blocking of request domain, response CNAME (deep CNAME inspection) and response IP addresses (against IP lists)
  • Advanced DNS configuration - not just an ad-blocker

    • Custom DNS resolution for certain domain names
    • Conditional forwarding to external DNS server
    • Upstream resolvers can be defined per client group
  • Performance - Improves speed and performance in your network

    • Customizable caching of DNS answers for queries -> improves DNS resolution speed and reduces amount of external DNS queries
    • Prefetching and caching of often used queries
    • Using multiple external resolver simultaneously
    • Low memory footprint
  • Various Protocols - Supports modern DNS protocols

    • DNS over UDP and TCP
    • DNS over HTTPS (aka DoH)
    • DNS over TLS (aka DoT)
  • Security and Privacy - Secure communication

    • Supports modern DNS extensions: DNSSEC, eDNS, ...
    • Free configurable blocking lists - no hidden filtering etc.
    • Provides DoH Endpoint
    • Uses random upstream resolvers from the configuration - increases your privacy through the distribution of your DNS traffic over multiple provider
    • Blocky does NOT collect any user data, telemetry, statistics etc.
  • Integration - various integration

    • Prometheus metrics
    • Prepared Grafana dashboards (Prometheus and database)
    • Logging of DNS queries per day / per client in CSV format or MySQL/MariaDB/PostgreSQL database - easy to analyze
    • Various REST API endpoints
    • CLI tool
  • Simple configuration - single or multiple configuration files in YAML format

    • Simple to maintain
    • Simple to backup
  • Simple installation/configuration - blocky was designed for simple installation

    • Stateless (no database, no temporary files)
    • Docker image with Multi-arch support
    • Single binary
    • Supports x86-64 and ARM architectures -> runs fine on Raspberry PI
    • Community supported Helm chart for k8s deployment

Quick start

You can jump to Installation chapter in the documentation.

Full documentation

You can find full documentation and configuration examples at: https://0xERR0R.github.io/blocky/


Issues, feature suggestions and pull requests are welcome!