| Date | IP Address |
| 2020-08-26 | 23.197.195.216 (ClassC) |
| 2025-04-04 | 23.41.4.72 (ClassC) |
| 2025-07-24 | 23.41.4.88 (ClassC) |
| Date | Domain | IP |
| bizid.chugin.co.jp | 2023-12-01 | 104.96.163.214 |
| dev-bizid.chugin.co.jp | 2025-04-10 | 23.41.4.88 |
| service.chugin.co.jp | 2024-11-24 | 23.41.4.84 |
| test-service.chugin.co.jp | 2025-03-26 | 23.41.4.88 |
| auth.chugin.co.jp | 2024-01-08 | 104.96.163.214 |
| test-auth.chugin.co.jp | 2025-04-04 | 23.41.4.72 |
| dev-auth.chugin.co.jp | 2025-04-04 | 23.41.4.88 |
| direct.chugin.co.jp | 2024-01-16 | 104.16.205.233 |
| www.chugin.co.jp | 2023-08-25 | 23.49.0.122 |