NN was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Rudná and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Rudná) | Austro-Hungary | Kladno | before the Treaty of Saint-Germain |
| NN | Czechoslovakia | Kladno | after the Treaty of Saint-Germain |
| NN | German Empire | Kladno | 1939 |
| NN | Czechoslovakia | Praha-západ | 1945 |
| Rudná | Czechoslovakia | Praha-západ | 1992 |
| Rudná | Czech Republic | Praha-západ | 1993 |