# File lib/fog/aws/requests/dns/change_resource_record_sets.rb, line 190
      def self.hosted_zone_for_alias_target(dns_name)
        k = elb_hosted_zone_mapping.keys.find do |k|
          dns_name =~ /\A.+\.#{k}\.elb\.amazonaws\.com\.?\z/
        end
        elb_hosted_zone_mapping[k]
      end