| Date | IP Address |
| 2024-05-03 | 34.237.109.5 (ClassC) |
| 2024-07-07 | 44.196.209.230 (ClassC) |
| 2024-07-27 | 34.192.54.164 (ClassC) |
| 2024-08-14 | 3.209.158.189 (ClassC) |
| 2024-11-25 | 52.20.210.13 (ClassC) |
| 2024-12-26 | 54.86.228.116 (ClassC) |
| 2025-01-21 | 34.197.116.141 (ClassC) |
| 2025-02-16 | 52.200.107.87 (ClassC) |
| 2025-06-25 | 3.230.227.64 (ClassC) |
| 2025-06-30 | 44.219.106.81 (ClassC) |
| Date | Domain | IP |
| api.cert2.eng.hmhco.com | 2024-06-03 | 35.171.178.29 |
| issue.eng.hmhco.com | 2024-08-22 | 18.238.238.38 |
| api.eng.hmhco.com | 2023-08-15 | 44.194.147.200 |
| api.cert.eng.hmhco.com | 2024-05-03 | 34.237.109.5 |
| api.prodrv.eng.hmhco.com | 2024-06-10 | 3.219.114.190 |