# File lib/fog/aws/requests/dns/change_resource_record_sets.rb, line 5
      def self.hosted_zone_for_alias_target(dns_name)
        hosted_zones = if dns_name.match(/^dualstack\./)
          elb_dualstack_hosted_zone_mapping
        else
          elb_hosted_zone_mapping
        end

        Hash[hosted_zones.select { |k, _|
          dns_name =~ /\A.+\.#{k}\.elb\.amazonaws\.com\.?\z/
        }].values.last
      end