Johannesdorf was formerly part of the German Empire. In the German Empire, the place was called Johannesdorf.
The place is now called Janov and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Johannesdorf | Austro-Hungary | Plan | before the Treaty of Saint-Germain |
| Janov | Czechoslovakia | Planá | after the Treaty of Saint-Germain |
| Johannesdorf | Czechoslovakia | Planá | after the Treaty of Saint-Germain |
| Johannesdorf | German Empire | Tachau | 1938 |
| Janov | Czechoslovakia | Tachov | 1945 |
| Janov | Czechoslovakia | Tachov | 1992 |
| Janov | Czech Republic | Tachov | 1993 |