Ratka was formerly part of the German Empire. In the German Empire, the place was called Ratka.
The place is now called Hrádek and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ratka | Austro-Hungary | Luditz | before the Treaty of Saint-Germain |
| Hrádek | Austro-Hungary | Luditz | before the Treaty of Saint-Germain |
| Hrádek | Czechoslovakia | Kralovice | after the Treaty of Saint-Germain |
| Ratka | Czechoslovakia | Kralovice | after the Treaty of Saint-Germain |
| Ratka | German Empire | Luditz | 1938 |
| Hrádek | Czechoslovakia | Plasny | 1945 |
| Hrádek | Czechoslovakia | Plzeň-sever | 1992 |
| Hrádek | Czech Republic | Plzeň-sever | 1993 |