| Date | IP Address |
| 2021-08-28 | 13.226.29.3 (ClassC) |
| 2021-11-12 | 13.32.150.116 (ClassC) |
| 2022-04-21 | 13.32.66.12 (ClassC) |
| 2022-06-06 | 65.8.20.81 (ClassC) |
| 2022-07-15 | 13.32.145.79 (ClassC) |
| 2023-08-15 | 99.86.38.55 (ClassC) |
| 2023-09-05 | 3.162.103.34 (ClassC) |
| 2023-12-01 | 99.84.66.80 (ClassC) |
| 2024-02-22 | 99.84.66.22 (ClassC) |
| 2024-08-05 | 104.18.22.186 (ClassC) |
| 2025-05-10 | 104.18.39.119 (ClassC) |
| 2025-07-16 | 172.64.148.137 (ClassC) |
| Date | Domain | IP |
| staging.cliffsnotes.com | 2024-10-05 | 3.165.160.106 |
| www.cliffsnotes.com | 2023-12-01 | 99.84.66.80 |