| Date | IP Address |
| 2020-12-10 | 96.17.11.185 (ClassC) |
| 2024-12-30 | 23.41.4.88 (ClassC) |
| 2025-07-30 | 23.41.4.72 (ClassC) |
| Date | Domain | IP |
| auth.ryugin.co.jp | 2023-11-28 | 104.96.163.214 |
| test-auth.ryugin.co.jp | 2024-12-30 | 23.41.4.88 |
| dev-auth.ryugin.co.jp | 2024-08-10 | 104.96.163.138 |
| digital.ryugin.co.jp | 2024-02-24 | 104.96.163.200 |
| test-digital.ryugin.co.jp | 2025-03-24 | 23.41.4.88 |
| image.mail.ryugin.co.jp | 2024-07-30 | 184.25.244.40 |
| direct.ryugin.co.jp | 2024-09-09 | 104.16.230.99 |
| asset.ryugin.co.jp | 2024-11-18 | 3.163.24.15 |
| www.ryugin.co.jp | 2024-01-23 | 54.65.29.25 |
| biz.ryugin.co.jp | 2024-06-29 | 23.41.4.71 |
| test-biz.ryugin.co.jp | 2024-08-19 | 23.54.19.130 |
| dev-biz.ryugin.co.jp | 2024-10-06 | 23.41.4.88 |