| Date | IP Address |
| 2023-08-25 | 104.86.251.249 (ClassC) |
| 2024-07-24 | 23.54.35.191 (ClassC) |
| 2024-10-01 | 23.209.27.204 (ClassC) |
| 2024-11-10 | 23.39.20.174 (ClassC) |
| 2025-04-14 | 23.41.4.90 (ClassC) |
| 2026-01-24 | 23.41.4.91 (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 |