I am a non-EU-citizen studying in Amsterdam who did an exchange semester in Germany. Since I am not a EU citizen, I had to get a National Visa (D) for my exchange Semester in Germany.
I remember quite well the officer at the German embassy in Amsterdam telling me that address registration wasn't necessary since I was planning to stay in Germany just for one semester (covered by the validity of my D-visa), not to extend my residence permit, and that they will just send a copy of forms to the city council. Therefore I finished my semester in Germany and now I'm moving back to Amsterdam without having register my address. But I'm starting to have doubts about this and I'm afraid I may have done something irregular. Is it normal? Would this affect my future application for a German visa if want to continue my studies there, e.g, a master or PhD?