| Date | IP Address |
| 2019-12-11 | 185.159.220.230 (ClassC) |
| 2024-12-29 | 172.67.217.242 (ClassC) |
| 2025-01-23 | 104.21.32.1 (ClassC) |
| 2025-03-07 | 104.21.48.1 (ClassC) |
| 2025-06-01 | 104.21.64.1 (ClassC) |
| 2026-01-26 | 104.21.53.192 (ClassC) |
| Date | Domain | IP |
| blog.mailtester.com | 2025-05-30 | 52.72.151.83 |
| app.mailtester.com | 2025-09-24 | 185.177.125.142 |
| www.mailtester.com | 2024-07-24 | 104.21.53.192 |