| Date | IP Address |
| 2021-01-16 | 54.74.252.47 (ClassC) |
| 2025-05-26 | 34.248.146.4 (ClassC) |
| 2025-09-02 | 54.194.34.129 (ClassC) |
| 2025-09-14 | 34.251.208.132 (ClassC) |
| 2025-11-25 | 52.210.40.150 (ClassC) |
| Date | Domain | IP |
| m.mail.css.ch | 2025-05-23 | 52.31.232.158 |
| res.mail.css.ch | 2024-10-05 | 3.163.24.26 |
| t.mail.css.ch | 2025-05-26 | 34.248.146.4 |