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