| Date | IP Address |
| 2020-12-03 | 52.85.134.129 (ClassC) |
| 2020-12-03 | 52.85.134.35 (ClassC) |
| 2020-12-03 | 52.85.134.101 (ClassC) |
| 2021-01-16 | 52.85.132.36 (ClassC) |
| 2021-01-16 | 52.85.132.49 (ClassC) |
| 2024-08-24 | 99.86.38.57 (ClassC) |
| 2024-12-27 | 99.86.38.117 (ClassC) |
| 2025-01-09 | 204.246.191.40 (ClassC) |
| 2025-04-18 | 204.246.191.20 (ClassC) |
| 2025-07-03 | 18.161.6.69 (ClassC) |
| 2025-08-07 | 204.246.191.10 (ClassC) |
| 2025-09-11 | 204.246.191.5 (ClassC) |
| 2026-02-08 | 3.169.173.8 (ClassC) |
| Date | Domain | IP |
| www.smart-letter.com | 2023-11-01 | 204.246.191.20 |