| Date | IP Address |
| 2023-08-27 | 52.28.20.51 (ClassC) |
| 2023-10-13 | 167.172.5.31 (ClassC) |
| 2025-01-29 | 193.163.206.232 (ClassC) |
| Date | Domain | IP |
| app.yfu.de | 2024-09-10 | 3.69.215.29 |
| intranet.yfu.de | 2024-06-10 | 18.192.112.227 |
| crt.yfu.de | 2024-12-19 | 20.52.100.107 |
| www.yfu.de | 2023-10-13 | 3.65.201.18 |