| Date | IP Address |
| 2020-07-08 | 172.67.216.244 (ClassC) |
| 2021-02-02 | 104.21.85.129 (ClassC) |
| 2021-04-16 | 172.64.105.15 (ClassC) |
| 2024-11-04 | 104.21.63.113 (ClassC) |
| 2024-12-26 | 172.67.145.112 (ClassC) |
| Date | Domain | IP |
| api.mailbluster.com | 2024-10-28 | 172.67.145.112 |
| echo.mailbluster.com | 2024-11-21 | 3.248.151.7 |
| app.mailbluster.com | 2024-11-04 | 104.21.63.113 |
| email-resources.mailbluster.com | 2024-04-19 | 104.21.63.113 |
| www.mailbluster.com | 2024-09-21 | 104.21.63.113 |