| Date | IP Address |
| 2024-04-12 | 18.210.98.9 (ClassC) |
| 2024-05-13 | 34.206.58.169 (ClassC) |
| 2024-05-25 | 3.210.23.204 (ClassC) |
| 2024-08-08 | 34.231.77.113 (ClassC) |
| 2024-08-14 | 3.209.124.92 (ClassC) |
| 2024-12-05 | 107.22.123.62 (ClassC) |
| 2024-12-23 | 54.145.6.221 (ClassC) |
| 2025-03-16 | 52.20.19.76 (ClassC) |
| 2025-06-14 | 3.216.16.192 (ClassC) |
| 2025-06-30 | 44.212.134.51 (ClassC) |
| Date | Domain | IP |
| woodwing-b.cert.ips-nonprod.hmhco.com | 2024-08-20 | 3.215.252.53 |
| hots-b.cert.ips-nonprod.hmhco.com | 2024-11-25 | 34.195.178.228 |
| hip.cert.ips-nonprod.hmhco.com | 2024-04-12 | 18.210.98.9 |
| webcms.cert.ips-nonprod.hmhco.com | 2024-12-25 | 45.60.11.203 |