| Date | IP Address |
| 2024-11-09 | 89.191.91.251 (ClassC) |
| Date | Domain | IP |
| assets1.hotel.check24.de | 2024-10-20 | 89.191.91.251 |
| assets2.hotel.check24.de | 2024-11-09 | 89.191.91.251 |
| assets3.hotel.check24.de | 2024-10-14 | 89.191.91.251 |
| cella.hotel.check24.de | 2024-10-14 | 89.191.91.251 |
| htc.hotel.check24.de | 2024-09-27 | 89.191.91.251 |
| m.hotel.check24.de | 2024-08-25 | 89.191.91.251 |
| www.m.hotel.check24.de | 2024-09-27 | 89.191.91.251 |
| assets.hotel.check24.de | 2024-10-14 | 89.191.91.251 |
| assistant.hotel.check24.de | 2024-10-25 | 89.191.91.251 |
| api-mw.hotel.check24.de | 2024-08-15 | 89.191.91.251 |
| www.hotel.check24.de | 2024-11-09 | 89.191.91.251 |