| No. | Vessel Name | Call sign | carrier Code(NACCS Code) | NACCS user ID |
| 6181 | OHSHU MARU | A8ZJ5 | NYKS | 2O6KA |
| 6182 | OINOUSSIAN LION | 20131009 | 13VX | 8HTOF |
| 6183 | OITA MARU | H9CN | NYKS | 6XKIT |
| 6184 | OKEANOS BLISS | 3FOR6 | 13PC | 5DKAM |
| 6185 | OKHOTSK SEA | ELUZ6 | 13MV | 9ASKE |
| 6186 | OKHTA BRIDGE | A8AR5 | 13JP | 5AEAU |
| 6187 | OKINAWA | A8MJ2 | 13PB | 6HKAI |
| 6188 | OLGA TOPIC | ELSG4 | 13JP | 3BTKL |
| 6189 | OLKHON | XUGM2 | 31VE | 8ZHKT |
| 6190 | OLUJA | V7QE8 | 13VQ | 5CGYO |
| 6191 | OLVIA | V7PH5 | 31OH | 6DGSL |
| 6192 | OLYMPIA | A8OB5 | OOLU | YMSTE |
| 6193 | OLYMPIAN HIGHWAY | 3FSH4 | KKLU | 2HDUK |
| 6194 | OLYMPIC FUTURE | SYQH | 13JP | 3MSTE |
| 6195 | OLYMPIC LIBERTY | SYBO | 13JP | 4K6KA |
