| Date | IP Address |
| 2019-11-19 | 92.51.131.161 (ClassC) |
| 2025-09-24 | 5.44.100.212 (ClassC) |
| 2026-01-06 | 89.22.121.183 (ClassC) |
| Date | Domain | IP |
| mta.holk.net | 2025-05-27 | 5.44.100.212 |
| vmail.holk.net | 2025-04-29 | 5.44.100.212 |
| mails.holk.net | 2025-05-07 | 5.44.100.212 |
| mxs.holk.net | 2025-08-10 | 5.44.100.212 |
| www.holk.net | 2025-09-24 | 5.44.100.212 |
| mailrelay.holk.net | 2025-08-02 | 5.44.100.212 |