Sdunken was formerly part of the German Empire. In the German Empire, the place was called Ulrichsfelde (Ostpr.).
The place is now called Zdunki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sdunken | German Empire | Lyck | 1938 |
| Ulrichsfelde (Ostpr.) | German Empire | Lyck | 1939 |
| Zdunki | Under Polish administration | Ełk | 1945 |
| Zdunki | Poland | Suwałki | 1992 |