| Date | IP Address |
| 2024-05-26 | 54.150.17.139 (ClassC) |
| 2024-05-26 | 18.179.245.236 (ClassC) |
| 2025-04-04 | 54.178.12.35 (ClassC) |
| 2025-04-25 | 54.238.123.143 (ClassC) |
| 2025-08-08 | 54.249.150.55 (ClassC) |
| 2025-09-15 | 3.114.74.87 (ClassC) |
| 2025-10-20 | 35.73.214.197 (ClassC) |
| 2025-12-08 | 52.196.49.250 (ClassC) |
| Date | Domain | IP |
| stg.houjin-correspondence.inside.kumon.ne.jp | 2025-11-10 | 52.199.109.125 |
| lil.inside.kumon.ne.jp | 2025-04-05 | 35.74.148.65 |
| dev.lil.inside.kumon.ne.jp | 2025-04-04 | 54.178.12.35 |
| ofs.inside.kumon.ne.jp | 2025-04-05 | 18.176.1.33 |
| stg.ofs.inside.kumon.ne.jp | 2025-04-05 | 54.249.36.143 |
| uat.ofs.inside.kumon.ne.jp | 2025-04-04 | 52.196.18.219 |
| dev.ofs.inside.kumon.ne.jp | 2025-04-05 | 3.115.30.194 |
| inst.inside.kumon.ne.jp | 2025-04-04 | 52.68.181.187 |
| dev.inst.inside.kumon.ne.jp | 2025-04-04 | 57.181.157.197 |
| i-ku.inside.kumon.ne.jp | 2025-04-05 | 54.65.191.233 |
| dev.i-ku.inside.kumon.ne.jp | 2025-04-04 | 52.198.141.82 |
| feasibility.inside.kumon.ne.jp | 2025-04-04 | 35.76.22.166 |