| Date | IP Address |
| 2019-05-11 | 81.4.106.97 (ClassC) |
| 2025-11-23 | 81.4.100.194 (ClassC) |
| Date | Domain | IP |
| cloud.felb.online | 2025-08-12 | 81.4.100.194 |
| nextcloud.felb.online | 2025-11-23 | 81.4.100.194 |
| cal.felb.online | 2025-05-23 | 81.4.100.194 |
| vpn.felb.online | 2025-08-13 | 81.4.100.194 |
| mw.felb.online | 2025-09-15 | 81.4.100.194 |