| Date | IP Address |
| 2022-06-20 | 52.58.206.187 (ClassC) |
| 2023-02-21 | 3.73.171.248 (ClassC) |
| 2026-02-01 | 80.158.80.50 (ClassC) |
| Date | Domain | IP |
| id.lernen.cornelsen.de | 2026-01-07 | 80.158.81.4 |
| api.lernen.cornelsen.de | 2026-02-01 | 80.158.80.50 |
| bildungslogin.lernen.cornelsen.de | 2024-04-18 | 18.195.27.241 |
| app.lernen.cornelsen.de | 2026-01-07 | 80.158.80.50 |