Alsleben süden der Au was formerly part of the German Empire. In the German Empire, the place was called Alsleben süden der Au.
The place is now called NN and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Alsleben süden der Au | German Empire | Tondern | before the Versailles Treaty |
| Alslev | Denmark | Tønder | after the Versailles Treaty |
| NN | Denmark | Sønderjylland | 1993 |