NN was formerly part of the German Empire. In the German Empire, the place was called Bladnitz.
The place is now called NN and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Bladnitz) | Austro-Hungary | Bielitz/Bielsko | before the Treaty of Saint-Germain |
| NN | Poland | Cieszyn | after the Treaty of Saint-Germain |
| Bladnitz | German Empire | Teschen | 1939 |
| Bładnice | Poland | Cieszyn | 1945 |
| NN | Poland | Bielsko | 1992 |