| Date | IP Address |
| 2021-04-23 | 63.32.225.219 (ClassC) |
| 2025-02-15 | 52.209.121.61 (ClassC) |
| 2025-05-07 | 54.170.9.189 (ClassC) |
| 2025-05-15 | 52.48.88.70 (ClassC) |
| 2025-07-18 | 54.194.85.63 (ClassC) |
| 2025-08-30 | 52.31.229.16 (ClassC) |
| 2026-02-14 | 185.104.28.238 (ClassC) |
| Date | Domain | IP |
| smtp1.jovdleiden.nl | 2025-02-11 | 54.78.75.229 |
| email.jovdleiden.nl | 2025-02-16 | 52.209.121.61 |
| www.jovdleiden.nl | 2025-02-15 | 52.209.121.61 |