| Date | IP Address |
| 2025-01-08 | 219.109.9.19 (ClassC) |
| Date | Domain | IP |
| kensho.shiken-kanri.retio.or.jp | 2024-11-26 | 202.24.99.9 |
| www.retio.or.jp | 2024-11-25 | 172.233.81.82 |
| www-apply.retio.or.jp | 2025-01-08 | 219.109.9.19 |
| kensho-yuuso-entry.retio.or.jp | 2024-11-26 | 202.24.99.14 |