code: public static ZoneTransferIn
  newAXFR(Name zone, String host, int port, TSIG key)
  throws UnknownHostException
  {
  	if (port == 0)
  		port = SimpleResolver.DEFAULT_PORT;
  	return newAXFR(zone, new InetSocketAddress(host, port), key);
  }
docs: Instantiates a ZoneTransferIn object to do an AXFR (full zone transfer).
  @param zone The zone to transfer.
  @param host The host from which to transfer the zone.
  @param port The port to connect to on the server, or 0 for the default.
  @param key The TSIG key used to authenticate the transfer, or null.
  @return The ZoneTransferIn object.
  @throws UnknownHostException The host does not exist.