| Date | IP Address |
| 2024-11-24 | 3.231.72.27 (ClassC) |
| 2024-12-14 | 44.208.122.66 (ClassC) |
| 2025-01-12 | 54.221.129.220 (ClassC) |
| 2025-02-20 | 100.27.74.206 (ClassC) |
| 2025-03-15 | 44.205.66.168 (ClassC) |
| 2025-04-20 | 34.232.199.142 (ClassC) |
| 2025-05-03 | 44.207.125.31 (ClassC) |
| 2025-05-27 | 44.211.110.95 (ClassC) |
| 2025-06-18 | 44.206.12.68 (ClassC) |
| 2025-07-22 | 52.21.243.5 (ClassC) |
| 2025-07-30 | 54.84.254.84 (ClassC) |
| 2025-08-02 | 34.198.171.34 (ClassC) |
| 2025-08-21 | 54.159.176.151 (ClassC) |
| 2026-01-09 | 98.88.192.64 (ClassC) |
| Date | Domain | IP |
| owa.hmhpub.com | 2025-09-26 | 207.127.63.247 |
| ep.hmhpub.com | 2025-07-21 | 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 |