# File lib/dnstraverse/info_cache.rb, line 50
    def add_hints(domain, ns)
      rrs = Array.new
      for server in ns do
        rrs.push Dnsruby::RR.create(:name => domain, :ttl => 0,
                                    :type => 'NS', :domainname => server[:name])
        for ip in server[:ips] do
          type = (ip.to_s =~ /\A(\d+)\.(\d+)\.(\d+)\.(\d+)\z/) ? 'A' : 'AAAA'
          rrs.push Dnsruby::RR.create(:type => type, :ttl => 0,
                                      :name => server[:name], :address => ip)
        end
      end
      return add(rrs)
    end