Irrgang was formerly part of the German Empire. In the German Empire, the place was called Irrgang.
The place is now called Bludná and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Irrgang | Austro-Hungary | Neudek | before the Treaty of Saint-Germain |
| Bludná | Czechoslovakia | Nejdek | after the Treaty of Saint-Germain |
| Irrgang | Czechoslovakia | Nejdek | after the Treaty of Saint-Germain |
| Irrgang | German Empire | Neudek | 1938 |
| Bludná | Czechoslovakia | Jáchymov | 1945 |
| Bludná | Czechoslovakia | Karlovy Vary | 1992 |
| Bludná | Czech Republic | Karlovy Vary | 1993 |