code: public synchronized NbtAddress getByName ( String host, CIFSContext tc ) {
          return getByName(new Name(tc.getConfig(), host, 0x20, null), tc);
      }
docs: This is really just for {@link jcifs.netbios.UniAddress}. It does
  not throw an {@link java.net.UnknownHostException} because this
  is queried frequently and exceptions would be rather costly to
  throw on a regular basis here.
  
  @param host
  @param tc
  @return resolved name, null if not found