Pirken was formerly part of the German Empire. In the German Empire, the place was called Pirken.
The place is now called Březenec (Jirkov-Březenec) and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Pirken | Austro-Hungary | Komotau | before the Treaty of Saint-Germain |
| Březenec | Austro-Hungary | Komotau | before the Treaty of Saint-Germain |
| Březenec | Czechoslovakia | Chomutov | after the Treaty of Saint-Germain |
| Pirken | Czechoslovakia | Chomutov | after the Treaty of Saint-Germain |
| Pirken | German Empire | Komotau | 1938 |
| Březenec | Czechoslovakia | Chomutov | 1945 |
| Březenec (Jirkov-Březenec) | Czechoslovakia | Chomutov | 1992 |
| Březenec (Jirkov-Březenec) | Czech Republic | Chomutov | 1993 |