Gelstoft was formerly part of the German Empire. In the German Empire, the place was called Gjelstoft.
The place is now called Gelstoft and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gjelstoft | German Empire | Hadersleben | before the Versailles Treaty |
| Gelstoft | Denmark | Haderslev | after the Versailles Treaty |
| Gelstoft | Denmark | Sønderjylland | 1993 |