| Date | IP Address |
| 2020-06-21 | 2.18.66.41 (ClassC) |
| 2020-06-21 | 2.18.66.72 (ClassC) |
| 2020-06-23 | 23.48.209.43 (ClassC) |
| 2020-07-30 | 104.86.111.34 (ClassC) |
| 2021-02-25 | 184.26.95.137 (ClassC) |
| 2021-02-25 | 184.26.95.163 (ClassC) |
| 2024-02-24 | 184.28.93.9 (ClassC) |
| 2024-08-10 | 23.55.167.24 (ClassC) |
| 2024-09-07 | 23.41.4.23 (ClassC) |
| 2024-09-19 | 23.41.4.90 (ClassC) |
| 2025-01-13 | 23.41.4.77 (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 |