| Date | IP Address |
| 2014-01-16 | 88.190.216.65 (ClassC) |
| 2014-06-14 | 212.129.21.49 (ClassC) |
| 2015-02-22 | 178.33.109.84 (ClassC) |
| 2015-03-07 | 46.105.73.33 (ClassC) |
| 2015-09-13 | 212.129.34.123 (ClassC) |
| 2018-07-07 | 212.129.17.51 (ClassC) |
| 2019-12-01 | 195.154.35.34 (ClassC) |
| 2020-06-02 | 5.9.127.255 (ClassC) |
| 2025-07-01 | 135.125.37.246 (ClassC) |
| 2026-02-27 | 136.243.31.58 (ClassC) |
| Date | Domain | IP |
| dev.sigmundmail.com | 2025-05-26 | 135.125.37.246 |
| www.sigmundmail.com | 2015-02-22 | 178.33.109.84 |