| Date | IP Address |
| 2023-09-01 | 3.90.96.235 (ClassC) |
| 2023-12-01 | 34.225.217.32 (ClassC) |
| 2024-05-05 | 44.196.111.234 (ClassC) |
| 2024-11-05 | 3.213.25.83 (ClassC) |
| 2024-11-24 | 18.210.132.154 (ClassC) |
| 2024-12-23 | 44.208.122.66 (ClassC) |
| 2025-01-16 | 44.215.53.241 (ClassC) |
| Date | Domain | IP |
| reads.harcourtachieve.com | 2024-11-24 | 54.88.81.136 |
| www.harcourtachieve.com | 2025-01-06 | 209.235.125.89 |
| rigby.harcourtachieve.com | 2024-11-24 | 54.88.81.136 |