| Date | IP Address |
| 2016-10-04 | 104.101.209.35 (ClassC) |
| 2016-10-04 | 65.152.202.200 (ClassC) |
| 2024-08-04 | 23.48.4.89 (ClassC) |
| 2024-08-05 | 104.88.206.81 (ClassC) |
| 2024-08-05 | 23.46.23.72 (ClassC) |
| 2024-08-06 | 23.215.11.61 (ClassC) |
| 2024-08-06 | 104.88.206.83 (ClassC) |
| 2024-08-09 | 23.205.89.73 (ClassC) |
| 2024-12-11 | 23.32.45.163 (ClassC) |
| 2025-04-09 | 23.32.75.138 (ClassC) |
| 2025-07-17 | 23.192.230.5 (ClassC) |
| 2025-10-21 | 23.46.228.9 (ClassC) |
| 2025-12-27 | 23.32.75.162 (ClassC) |
| 2026-01-25 | 23.192.230.13 (ClassC) |
| Date | Domain | IP |
| image.engage.frontiersin.net | 2024-09-09 | 184.28.50.137 |
| click.engage.frontiersin.net | 2025-04-09 | 23.32.75.138 |
| docs.frontiersin.net | 2025-10-16 | 34.194.81.15 |