WThe Etorofu-class escort ships were a group of fourteen kaibōkan escort vessels built for the Imperial Japanese Navy during World War II. Eight of the fourteen ships were sunk during the war. The class was also referred to by internal Japanese documents as the "Modified A-class" coastal defense vessel .
WThe Hiburi-class escort ship was a sub-class of the Mikura-class escort ships of the Imperial Japanese Navy (IJN), serving during and after World War II.
WThe Mikura-class escort ships were a class of eight kaibōkan escort vessels built for the Imperial Japanese Navy during World War II. Five of the eight ships were sunk during the war. The class was also referred to by internal Japanese documents as the "B-class" coastal defense vessel .
WThe Shimushu-class escort ships were a class of kaibōkan built for the Imperial Japanese Navy just prior to World War II. Four ships out of an initially planned 16 vessels were completed. The class was also referred to by internal Japanese documents as the "A-class" coastal defense vessel .
WThe Type C escort ships were a class of escort ships in the service of the Imperial Japanese Navy during World War II. The Japanese called them "Type C" ocean defense ships, and they were the fifth class of Kaibōkan, a name used to denote a multi-purpose vessel.
WThe Type D escort ships were a class of escort ships in the service of the Imperial Japanese Navy during World War II. The Japanese called them "Type D" coast defence ships, and they were the sixth class of Kaibōkan, a name used to denote a multi-purpose vessel. 143 ships were ordered under the 1943-44 Programme, and a further 57 units were planned under the 1944-45 Programme, for an overal total of 200 ships. However only 67 were completed, with the remainder being cancelled.
WThe Ukuru-class escort ships were a class of twenty kaibōkan escort vessels built for the Imperial Japanese Navy during World War II. The class was also referred to by internal Japanese documents as the "Modified B-class" coastal defense vessel , and they were the fourth class of kaibōkan.