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