| Date | IP Address |
| 2019-05-09 | 3.210.90.65 (ClassC) |
| 2024-08-10 | 104.18.19.37 (ClassC) |
| 2025-04-17 | 104.18.34.21 (ClassC) |
| 2025-07-30 | 172.64.153.235 (ClassC) |
| Date | Domain | IP |
| api.mentor.duden.de | 2023-08-16 | 3.65.168.236 |
| lp.mentor.duden.de | 2023-08-09 | 13.56.128.144 |
| angebot.mentor.duden.de | 2024-08-10 | 104.18.19.37 |