NN was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Hajnice and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Hajnice) | Austro-Hungary | Trautenau | before the Treaty of Saint-Germain |
| NN | Czechoslovakia | Trutnov | after the Treaty of Saint-Germain |
| NN | German Empire | Trautenau | 1938 |
| NN | Czechoslovakia | Dvůr Králové nad Labem | 1945 |
| Hajnice | Czechoslovakia | Trutnov | 1992 |
| Hajnice | Czech Republic | Trutnov | 1993 |