Blaustein was formerly part of the German Empire. In the German Empire, the place was called Blaustein.
The place is now called NN and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Blaustein | German Empire | Rastenburg | 1939 |
| NN | Under Polish administration | Kętrzyn | 1945 |
| NN | Poland | Olsztyn | 1992 |