| Date | IP Address |
| 2016-04-27 | 23.2.16.27 (ClassC) |
| 2016-08-02 | 23.10.240.154 (ClassC) |
| 2017-06-05 | 65.152.202.147 (ClassC) |
| 2025-01-12 | 13.110.52.11 (ClassC) |
| 2025-02-23 | 13.110.52.4 (ClassC) |
| 2025-06-12 | 13.110.52.8 (ClassC) |
| 2025-06-22 | 13.110.52.9 (ClassC) |
| 2025-10-03 | 13.110.52.10 (ClassC) |
| 2025-12-19 | 136.146.208.80 (ClassC) |
| 2025-12-29 | 136.146.208.79 (ClassC) |
| 2026-01-01 | 136.146.208.81 (ClassC) |
| 2026-01-04 | 136.146.208.78 (ClassC) |
| Date | Domain | IP |
| e.sej.co.jp | 2025-01-12 | 13.110.52.11 |
| semdsk.sej.co.jp | 2025-12-20 | 35.186.218.146 |
| ml.sej.co.jp | 2024-09-26 | 35.78.167.107 |
| cdn.sej.co.jp | 2025-12-29 | 146.75.41.194 |
| coupon.sej.co.jp | 2025-12-20 | 133.250.180.165 |
| app.sej.co.jp | 2026-01-01 | 45.60.12.81 |
| faq.sej.co.jp | 2025-05-17 | 18.65.229.33 |
| fc-owner.sej.co.jp | 2025-09-06 | 3.33.137.190 |
| semdsk-s1-a.itemtest.sej.co.jp | 2025-09-20 | 35.186.219.86 |
| semdsk-s1-b.itemtest.sej.co.jp | 2026-01-01 | 35.190.49.133 |
| www.sej.co.jp | 2025-12-29 | 45.60.12.81 |