| Date | IP Address |
| 2016-07-14 | 141.0.17.57 (ClassC) |
| 2019-10-08 | 116.202.103.32 (ClassC) |
| 2025-07-31 | 89.238.73.30 (ClassC) |
| Date | Domain | IP |
| consulting.koelter.com | 2025-05-12 | 89.238.73.30 |
| solarlog.koelter.com | 2025-06-06 | 89.238.73.30 |
| www.koelter.com | 2025-05-03 | 89.238.73.30 |