| Date | IP Address |
| 2021-08-10 | 23.65.251.45 (ClassC) |
| 2024-11-02 | 92.123.203.141 (ClassC) |
| 2025-06-26 | 23.222.144.166 (ClassC) |
| 2025-09-07 | 23.196.202.214 (ClassC) |
| 2025-10-14 | 184.26.149.51 (ClassC) |
| 2026-02-09 | 104.90.249.158 (ClassC) |
| Date | Domain | IP |
| cloud.email.a1.bg | 2025-09-07 | 161.71.49.42 |
| image.email.a1.bg | 2024-11-02 | 92.123.203.141 |
| click.email.a1.bg | 2025-09-07 | 161.71.50.255 |
| view.email.a1.bg | 2025-09-07 | 161.71.52.255 |