NN was formerly part of the German Empire. In the German Empire, the place was called Heggen.
The place is now called Heggen and belongs to Belgium.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Heggen) | German General Government of Belgium | Belgisch-Deutsches Gen.-Gouv. | before the Versailles Treaty |
| NN | Belgium | Liège | after the Versailles Treaty |
| Heggen | German Empire | Eupen (einschl. Moresnet) | 1940 |
| Heggen | Belgium | Liège | 1945 |
| Heggen | Belgium | Lüttich/Liège | 1993 |