| Date | IP Address |
| 2023-08-28 | 85.13.143.117 (ClassC) |
| 2025-12-10 | 85.13.136.144 (ClassC) |
| Date | Domain | IP |
| mx10.stefankast.at | 2025-11-24 | 85.13.136.144 |
| imap1.stefankast.at | 2025-11-25 | 85.13.136.144 |
| mx1.stefankast.at | 2025-11-24 | 85.13.136.144 |
| ns2.stefankast.at | 2025-11-25 | 85.13.136.144 |
| secure.stefankast.at | 2025-11-27 | 85.13.136.144 |
| email.stefankast.at | 2025-11-26 | 85.13.136.144 |
| www.stefankast.at | 2023-08-28 | 85.13.143.117 |
| mx.stefankast.at | 2025-12-05 | 85.13.136.144 |
| relay.stefankast.at | 2025-12-01 | 85.13.136.144 |