| Date | IP Address |
| 2020-02-25 | 23.61.164.104 (ClassC) |
| 2023-06-11 | 23.201.64.62 (ClassC) |
| 2024-05-08 | 23.218.6.95 (ClassC) |
| 2024-06-27 | 23.202.10.95 (ClassC) |
| 2025-01-19 | 23.196.152.65 (ClassC) |
| 2025-09-01 | 2.19.130.144 (ClassC) |
| 2026-01-21 | 184.24.34.114 (ClassC) |
| Date | Domain | IP |
| image.email.springjapan.com | 2025-01-19 | 23.196.152.65 |
| campus.springjapan.com | 2025-08-15 | 20.44.128.65 |
| www.springjapan.com | 2019-10-02 | 104.46.226.70 |
| 410.www.springjapan.com | 2025-12-22 | 20.44.130.53 |