| Date | IP Address |
| 2023-06-24 | 54.209.63.70 (ClassC) |
| 2023-09-03 | 3.90.96.235 (ClassC) |
| 2024-02-05 | 23.20.149.239 (ClassC) |
| 2024-11-02 | 54.159.39.108 (ClassC) |
| 2024-11-24 | 18.210.132.154 (ClassC) |
| 2024-12-23 | 54.221.192.231 (ClassC) |
| 2025-01-14 | 44.194.32.187 (ClassC) |
| 2025-02-19 | 3.219.4.107 (ClassC) |
| 2025-05-03 | 34.198.37.118 (ClassC) |
| 2025-06-18 | 44.206.12.68 (ClassC) |
| 2025-07-01 | 54.166.126.155 (ClassC) |
| 2025-07-13 | 18.214.219.215 (ClassC) |
| 2025-07-18 | 52.21.243.5 (ClassC) |
| 2025-07-29 | 50.17.240.142 (ClassC) |
| 2025-08-16 | 44.199.176.204 (ClassC) |
| 2025-08-28 | 54.159.176.151 (ClassC) |
| 2025-09-22 | 34.198.65.188 (ClassC) |
| 2025-10-24 | 3.208.230.114 (ClassC) |
| 2026-01-10 | 54.242.97.44 (ClassC) |
| 2026-02-06 | 3.227.107.66 (ClassC) |
| Date | Domain | IP |
| owa.hmhpub.com | 2025-09-26 | 207.127.63.247 |
| ep.hmhpub.com | 2026-01-21 | 209.235.124.31 |
| cert.ep.hmhpub.com | 2025-06-16 | 45.60.11.203 |
| meplanners.hmhpub.com | 2025-05-12 | 3.214.241.145 |
| mxplanners.hmhpub.com | 2024-11-24 | 18.210.132.154 |
| ws.hmhpub.com | 2025-02-19 | 50.17.16.132 |
| support.hmhpub.com | 2026-01-05 | 98.88.192.64 |
| techsupport.hmhpub.com | 2025-02-19 | 50.17.16.132 |
| www.hmhpub.com | 2024-11-24 | 3.231.72.27 |