| 2400:4040:18:: | 2400:4040:1f:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4040:20:: | 2400:4040:2f:ffff:ffff:ffff:ffff:ffff | NEC Corporation |
| 2400:4040:30:: | 2400:4040:31:ffff:ffff:ffff:ffff:ffff | NTTDATA SMS co.,ltd |
| 2400:4040:32:: | 2400:4040:35:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4040:36:: | 2400:4040:36:ffff:ffff:ffff:ffff:ffff | Shukobuild Co.,Ltd. |
| 2400:4040:37:: | 2400:4040:37:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4040:38:: | 2400:4040:38:ffff:ffff:ffff:ffff:ffff | IBM Japan,Ltd. |
| 2400:4040:39:: | 2400:4040:4f:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |
| 2400:4040:50:: | 2400:4040:50:ffff:ffff:ffff:ffff:ffff | XING INC. |
| 2400:4040:51:: | 2400:4040:52:ffff:ffff:ffff:ffff:ffff | NTT COMMUNICATIONS CORPORATION |