| Date | IP Address |
| 2015-01-03 | 23.21.128.193 (ClassC) |
| 2022-05-24 | 35.72.123.80 (ClassC) |
| 2026-01-17 | 18.180.206.198 (ClassC) |
| 2026-01-24 | 35.75.112.106 (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 |