Untermrač was formerly part of the German Empire. In the German Empire, the place was called Podmračí.
The place is now called Podmračí and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Untermrač | Austro-Hungary | Beneschau | before the Treaty of Saint-Germain |
| Mrač Dolní | Austro-Hungary | Beneschau | before the Treaty of Saint-Germain |
| Podmračí | Czechoslovakia | Benešov | after the Treaty of Saint-Germain |
| Unter-Mratsch | German Empire | Beneschau | 1939 |
| Podmračí | German Empire | Beneschau | 1939 |
| Podmračí | Czechoslovakia | Benešov | 1945 |
| Podmračí | Czechoslovakia | Střední Čechy | 1992 |