| Date | IP Address |
| 2017-05-12 | 107.21.37.170 (ClassC) |
| 2017-12-14 | 52.1.50.236 (ClassC) |
| 2019-01-31 | 34.225.210.169 (ClassC) |
| 2019-01-31 | 52.1.7.211 (ClassC) |
| 2019-06-01 | 34.197.40.240 (ClassC) |
| 2024-10-21 | 3.82.90.128 (ClassC) |
| 2024-11-28 | 3.224.213.250 (ClassC) |
| 2024-12-27 | 23.20.180.65 (ClassC) |
| 2025-08-01 | 34.196.6.42 (ClassC) |
| Date | Domain | IP |
| poczta.grumbacher.com | 2025-05-22 | 209.17.116.163 |
| jobsone.grumbacher.com | 2024-10-21 | 3.82.90.128 |
| email.grumbacher.com | 2025-06-02 | 209.17.116.163 |
| smtpseguro.grumbacher.com | 2025-05-31 | 209.17.116.163 |
| jobs.grumbacher.com | 2025-05-25 | 184.106.100.229 |