| Date | IP Address |
| 2025-03-06 | 13.113.161.56 (ClassC) |
| 2025-04-25 | 35.72.46.238 (ClassC) |
| 2025-06-30 | 18.182.100.30 (ClassC) |
| 2025-07-31 | 175.41.243.205 (ClassC) |
| 2025-10-15 | 52.199.142.193 (ClassC) |
| 2025-12-28 | 43.206.12.135 (ClassC) |
| 2026-01-21 | 13.115.204.74 (ClassC) |
| Date | Domain | IP |
| wordweb.kumon.co.jp | 2025-03-04 | 35.79.33.231 |
| knowledge.kumon.co.jp | 2024-10-24 | 18.179.114.238 |
| dev.frger.kumon.co.jp | 2025-03-06 | 13.113.161.56 |
| 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 |
| dev.webentry.kumon.co.jp | 2025-04-19 | 204.246.191.31 |