| Date | IP Address |
| 2024-11-25 | 34.195.178.228 (ClassC) |
| 2025-01-05 | 34.228.248.173 (ClassC) |
| 2025-01-12 | 44.195.107.24 (ClassC) |
| 2025-03-27 | 107.22.119.73 (ClassC) |
| 2025-04-20 | 35.175.31.70 (ClassC) |
| 2025-05-31 | 3.209.7.106 (ClassC) |
| 2025-06-29 | 34.225.243.97 (ClassC) |
| 2025-07-20 | 52.21.100.53 (ClassC) |
| 2025-09-02 | 34.238.108.102 (ClassC) |
| 2025-09-08 | 18.214.160.179 (ClassC) |
| 2025-09-11 | 107.23.231.7 (ClassC) |
| 2026-01-04 | 35.169.230.149 (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 |