| Date | IP Address |
| 2021-12-19 | 23.64.114.83 (ClassC) |
| 2022-04-09 | 23.42.159.40 (ClassC) |
| 2023-09-26 | 23.221.22.69 (ClassC) |
| 2024-09-06 | 23.41.4.13 (ClassC) |
| 2025-05-14 | 23.41.4.86 (ClassC) |
| Date | Domain | IP |
| www.ns21.ne.jp | 2025-04-27 | 23.41.4.72 |
| dev.www.ns21.ne.jp | 2024-09-06 | 23.41.4.13 |