sender

# File lib/resolv.rb, line 776
        def sender(msg, data, host, port=Port)
          lazy_initialize
          sock = @socks_hash[host.index(':') ? "::" : "0.0.0.0"]
          return nil if !sock
          service = [host, port]
          id = DNS.allocate_request_id(host, port)
          request = msg.encode
          request[0,2] = [id].pack('n')
          return @senders[[service, id]] =
            Sender.new(request, data, sock, host, port)
        end