| Date | IP Address |
| 2017-04-10 | 52.69.9.87 (ClassC) |
| 2017-06-09 | 52.196.56.98 (ClassC) |
| 2019-04-17 | 13.115.34.57 (ClassC) |
| 2019-09-30 | 52.68.54.221 (ClassC) |
| 2025-09-19 | 52.69.221.68 (ClassC) |
| 2025-10-23 | 57.182.106.128 (ClassC) |
| 2025-12-17 | 52.196.12.236 (ClassC) |
| 2026-01-31 | 35.76.147.67 (ClassC) |
| Date | Domain | IP |
| job.atmarkit.co.jp | 2023-08-25 | 54.238.85.132 |
| core.atmarkit.co.jp | 2024-12-16 | 54.150.32.4 |
| tech.atmarkit.co.jp | 2024-12-16 | 54.168.45.8 |
| jibun.atmarkit.co.jp | 2023-08-25 | 54.238.85.132 |
| lab.jibun.atmarkit.co.jp | 2025-11-21 | 54.65.205.188 |
| el.jibun.atmarkit.co.jp | 2023-08-25 | 18.178.244.202 |
| members.atmarkit.co.jp | 2025-09-15 | 54.150.112.210 |
| status.atmarkit.co.jp | 2025-09-19 | 52.69.221.68 |
| event.atmarkit.co.jp | 2026-01-17 | 18.180.206.198 |
| monoist.atmarkit.co.jp | 2024-12-23 | 54.168.45.8 |
| www.atmarkit.co.jp | 2023-11-01 | 176.34.25.82 |