| Date | IP Address |
| 2023-08-30 | 3.90.96.235 (ClassC) |
| 2024-11-24 | 3.231.72.27 (ClassC) |
| 2024-12-14 | 54.221.192.231 (ClassC) |
| 2025-01-08 | 54.162.242.88 (ClassC) |
| 2025-01-21 | 34.233.157.78 (ClassC) |
| 2025-01-28 | 18.211.216.138 (ClassC) |
| 2025-02-02 | 54.87.67.225 (ClassC) |
| 2025-04-13 | 52.54.40.155 (ClassC) |
| Date | Domain | IP |
| sample-v1.prod.webpr.hmhco.com | 2024-06-03 | 3.210.130.214 |
| support-v1.prod.webpr.hmhco.com | 2024-11-24 | 3.231.72.27 |