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