| Date | IP Address |
| 2023-07-12 | 52.35.186.169 (ClassC) |
| 2023-08-14 | 52.42.200.121 (ClassC) |
| 2023-11-27 | 54.188.119.229 (ClassC) |
| 2024-04-23 | 54.212.29.231 (ClassC) |
| 2024-05-01 | 52.24.252.33 (ClassC) |
| 2024-09-11 | 35.167.36.88 (ClassC) |
| 2024-10-01 | 54.213.215.8 (ClassC) |
| 2024-10-04 | 52.27.20.6 (ClassC) |
| 2024-10-20 | 35.83.184.46 (ClassC) |
| 2024-11-22 | 35.163.25.28 (ClassC) |
| 2024-12-28 | 52.43.126.234 (ClassC) |
| 2025-01-27 | 54.200.103.93 (ClassC) |
| 2025-02-17 | 52.40.160.184 (ClassC) |
| 2025-03-17 | 34.217.233.82 (ClassC) |
| 2025-04-04 | 52.26.138.42 (ClassC) |
| 2025-04-05 | 44.238.88.171 (ClassC) |
| 2025-05-16 | 54.187.28.142 (ClassC) |
| 2026-01-24 | 34.216.107.98 (ClassC) |
| Date | Domain | IP |
| help.letterstream.com | 2026-01-23 | 3.225.219.144 |
| www.letterstream.com | 2025-03-23 | 44.238.135.210 |