{...}: {
  services.blocky = {
    enable = true;
    settings = {
      ports.dns = 53; # Port for incoming DNS Queries.
      upstreams.groups.default = [
        "https://one.one.one.one/dns-query" # Using Cloudflare's DNS over HTTPS server for resolving queries.
      ];
      # For initially solving DoH/DoT Requests when no system Resolver is available.
      bootstrapDns = {
        upstream = "https://one.one.one.one/dns-query";
        ips = ["1.1.1.1" "1.0.0.1"];
      };
      blocking = {
        denylists = {
          ads = ["https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts"];
        };
        clientGroupsBlock = {
          default = ["ads"];
        };
      };
    };
  };
}