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| YEAR | DATE | EVENT | COMMISIONER |
| 1884 | 3 november | German colony | Gustav von Oertzen |
| 1887 | january | Georg Freiherr von Schleinitz | |
| 1888 | 1 march | Reinhold Kraetke | |
| 1889 | 31 october | Fritz Rose | |
| 1892 | 1 september | Georg Schmiele | |
| 1895 | 3 march | Hugo Rüdiger | |
| 1896 | 22 september | Curt von Hagen | |
| 1897 | 15 august | Albert Hahl | |
| 1897 | 11 september | Hugo Skopnik | |
| 1899 | 1 april | Rudolf von Bennigsen | |
| 1901 | 10 july | Albert Hahl | |
| 1914 | 13 april | Eduard Haber |
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| YEAR | DATE | EVENT |
| 1914 | 11 november | Australian occupation |
| 1920 | 17 december | Australian Trust administration |
| 1942 | 21 january | Japan occupation |
| 1944 | U.S. military administration | |
| 1946 | 8 december | Australian Trust administration |
| 1949 | Part of Papua-New Guinea Australian Trust administration |