| Date | IP Address |
| 2025-02-26 | 3.138.81.31 (ClassC) |
| 2025-04-18 | 18.189.35.217 (ClassC) |
| 2025-05-21 | 3.20.58.241 (ClassC) |
| 2025-08-02 | 3.139.170.76 (ClassC) |
| 2025-09-08 | 3.21.196.109 (ClassC) |
| 2025-10-15 | 3.139.153.132 (ClassC) |
| Date | Domain | IP |
| recruit.zenken.co.jp | 2024-02-21 | 52.194.42.71 |
| dev.recruit.zenken.co.jp | 2025-02-26 | 3.13.198.208 |
| dev.zenken.co.jp | 2025-02-26 | 3.138.81.31 |
| www.zenken.co.jp | 2023-11-01 | 54.249.116.8 |