| Date | IP Address |
| 2021-07-12 | 23.221.22.81 (ClassC) |
| 2021-07-12 | 23.221.22.85 (ClassC) |
| 2021-09-28 | 104.119.189.210 (ClassC) |
| 2021-10-01 | 104.125.2.138 (ClassC) |
| 2023-06-02 | 23.59.177.219 (ClassC) |
| 2023-07-15 | 184.30.42.156 (ClassC) |
| 2023-11-24 | 184.28.93.91 (ClassC) |
| 2024-02-05 | 23.214.170.40 (ClassC) |
| 2024-07-11 | 23.41.4.84 (ClassC) |
| 2025-06-25 | 23.41.4.69 (ClassC) |
| 2025-08-07 | 23.41.4.72 (ClassC) |
| Date | Domain | IP |
| k.river.go.jp | 2024-08-25 | 23.192.230.90 |
| frl.river.go.jp | 2023-08-25 | 104.86.251.249 |
| cam.river.go.jp | 2023-11-24 | 184.28.93.91 |
| www.river.go.jp | 2024-02-24 | 184.28.93.9 |
| test.www.river.go.jp | 2024-10-01 | 163.49.30.91 |