Blackswan,
you have to remember that not every 6-digit hex-code is used; there are vast ranges that are not allocated to any specific country (for future use?), and for those ranges that _are_ allocated there may be similar large quantities that are not used yet.
Your 22DD82 is one of the former, in a range not allocated to a country. It is almost certainly a bad decode (of which there are plenty), or incorrect data entered into the avionics (of which there are plenty).