| Date | IP Address |
| 2021-09-12 | 13.227.39.77 (ClassC) |
| 2022-04-14 | 52.85.61.70 (ClassC) |
| 2022-06-21 | 54.230.163.76 (ClassC) |
| 2022-06-21 | 54.230.163.84 (ClassC) |
| 2023-11-09 | 204.246.191.51 (ClassC) |
| 2024-12-30 | 204.246.191.43 (ClassC) |
| 2025-01-12 | 18.238.238.67 (ClassC) |
| 2025-04-04 | 18.238.238.13 (ClassC) |
| Date | Domain | IP |
| ccc2021spring.java-users.jp | 2024-07-29 | 18.161.6.35 |