| Date | IP Address |
| 2020-06-29 | 104.119.189.210 (ClassC) |
| 2020-07-04 | 23.43.164.24 (ClassC) |
| 2020-07-08 | 184.50.239.153 (ClassC) |
| 2020-07-08 | 23.35.71.187 (ClassC) |
| 2020-07-24 | 23.198.6.146 (ClassC) |
| 2020-07-24 | 23.198.6.191 (ClassC) |
| 2020-07-28 | 23.220.96.130 (ClassC) |
| 2021-08-14 | 204.237.204.106 (ClassC) |
| 2021-10-01 | 104.125.2.144 (ClassC) |
| 2022-04-25 | 23.48.210.18 (ClassC) |
| 2022-05-29 | 23.213.53.51 (ClassC) |
| 2023-08-01 | 23.221.220.33 (ClassC) |
| 2023-08-15 | 23.202.90.83 (ClassC) |
| 2023-09-11 | 23.220.103.14 (ClassC) |
| 2023-11-24 | 184.28.249.72 (ClassC) |
| 2024-08-25 | 23.192.230.90 (ClassC) |
| 2024-11-04 | 23.41.4.87 (ClassC) |
| 2025-04-13 | 23.41.4.76 (ClassC) |
| 2025-12-29 | 23.41.4.81 (ClassC) |
| 2026-01-23 | 23.41.4.90 (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 |