Detailed description
If you have moved to Hamburg from outside of Germany, you must re-register your vehicle immediately.
Moving within Hamburg:
If you move within Hamburg, you do not need to re-register your vehicle. However, you must submit your vehicle registration certificate, Part I, to the vehicle registration authority within 14 days to correct your address. You can also do this at one of the HamburgService locations at the same time as changing your address on your ID card.