| Date | IP Address |
| 2024-06-10 | 3.219.114.190 (ClassC) |
| 2024-07-07 | 34.228.48.89 (ClassC) |
| 2024-07-19 | 34.203.52.144 (ClassC) |
| 2024-08-14 | 52.86.143.240 (ClassC) |
| 2025-01-26 | 44.195.172.208 (ClassC) |
| 2025-04-15 | 34.202.143.207 (ClassC) |
| 2025-05-02 | 54.227.91.104 (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 |