Deffernik was formerly part of the German Empire. In the German Empire, the place was called Deffernik.
The place is now abandoned and the area belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Deffernik | Austro-Hungary | Klattau | before the Treaty of Saint-Germain |
| Debrník | Austro-Hungary | Klattau | before the Treaty of Saint-Germain |
| Debrník | Czechoslovakia | Klatovy | after the Treaty of Saint-Germain |
| Deffernik | Czechoslovakia | Klatovy | after the Treaty of Saint-Germain |
| Deffernik | German Empire | Markt Eisenstein | 1938 |
| Debrník | Czechoslovakia | Klatovy | 1945 |
| - aufgelassen - | Czechoslovakia | Klatovy | 1992 |
| - aufgelassen - | Czech Republic | Klatovy | 1993 |