NN was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called NN and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Rudná pod Pradědem) | Austro-Hungary | Freudenthal | before the Treaty of Saint-Germain |
| NN | Czechoslovakia | Bruntál | after the Treaty of Saint-Germain |
| NN | German Empire | Freudenthal | 1938 |
| NN | Czechoslovakia | Bruntál | 1945 |
| Rudná pod Pradědem | Czechoslovakia | Bruntál | 1945 |
| Rudná pod Pradědem | Czechoslovakia | Bruntál | 1992 |
| NN | Czech Republic | Bruntál | 1993 |