| Date | IP Address |
| 2021-07-14 | 13.226.201.59 (ClassC) |
| 2021-07-14 | 13.226.201.82 (ClassC) |
| 2021-07-14 | 13.249.137.35 (ClassC) |
| 2024-02-17 | 13.224.14.18 (ClassC) |
| 2024-08-11 | 204.246.191.113 (ClassC) |
| 2025-04-24 | 18.161.6.52 (ClassC) |
| 2026-01-22 | 3.169.173.103 (ClassC) |
| Date | Domain | IP |
| digital.dev.kumon.co.jp | 2024-12-31 | 99.84.66.29 |
| instructor.digital.dev.kumon.co.jp | 2024-02-26 | 99.84.66.111 |
| content.digital.dev.kumon.co.jp | 2024-02-17 | 13.224.14.18 |