01/02/1922-06/02/1922=Yokosuka ND;
06/02/1922-01/11/1925=Sub.Div.5; Ominato Defence Div.; Yokosuka ND;
01/11/1925-01/12/1926=Sub.Div.5; Yokosuka Defence Div.; Yokosuka ND;
01/12/1926-10/01/1927=Sub.Div.5; Yokosuka ND;
10/01/1927-01/04/1934=Sub.Div.5; Yokosuka Defence Div.; Yokosuka ND;

(A)CEO:Lt.Sekino Akira [38]=01/12/1020-01/08/1921;
(A)CO:Lt.Sekino Akira [38]=01/08/1921-01/12/1922;
CO:Lt.Cdr.Matsuoka Hirota [35]=01/12/1922-13/09/1923;
(A)CO:Lt.Furuki Momokura [41]=13/09/1923-01/12/1924;
CO:Lt.Ito Jotaro [42]=01/12/1924-01/12/1925;
CO:Lt/Lt.Cdr.Tsuruoka Nobukichi [43]=01/12/1925-01/04/1928;
(+)CO:Lt.Cdr.Hayashi Kiyosuke [43]=01/04/1928-10/12/1928;
CO:Lt.Miyazaki Takeji [46]=10/12/1928-15/11/1929;
(+)CO:Lt.Endo Keiyu [46]=15/11/1929-01/04/1930;
CO:

01/11/1924 Renamed RO-21;
01/04/1934 Removed from Navy List;
1934 Sold-Scuttled;