| 2400:4010:425:: | 2400:4010:426:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4010:427:: | 2400:4010:427:ffff:ffff:ffff:ffff:ffff | NTT Security (Japan) KK |
| 2400:4010:428:: | 2400:4010:428:ffff:ffff:ffff:ffff:ffff | Microsoft Japan Co.,Ltd. |
| 2400:4010:429:: | 2400:4010:429:ffff:ffff:ffff:ffff:ffff | Katayanagi Institute |
| 2400:4010:42a:: | 2400:4010:42b:ffff:ffff:ffff:ffff:ffff | SonicWall Japan |
| 2400:4010:42c:: | 2400:4010:42c:ffff:ffff:ffff:ffff:ffff | Net One Systems Co.,Ltd. |
| 2400:4010:42d:: | 2400:4010:42e:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4010:42f:: | 2400:4010:42f:ffff:ffff:ffff:ffff:ffff | KATAYAMA Holdings Co.,Ltd |
| 2400:4010:430:: | 2400:4010:430:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4010:431:: | 2400:4010:431:ffff:ffff:ffff:ffff:ffff | The Ministry of Health,Labour and Welfare |