| Date | IP Address |
| 2019-10-10 | 3.223.88.38 (ClassC) |
| 2020-05-26 | 52.55.138.40 (ClassC) |
| 2020-08-20 | 3.215.143.33 (ClassC) |
| 2021-08-13 | 18.210.198.119 (ClassC) |
| 2021-09-01 | 52.202.50.179 (ClassC) |
| 2022-06-24 | 52.71.167.6 (ClassC) |
| 2023-06-15 | 54.225.149.47 (ClassC) |
| 2025-05-21 | 141.101.90.97 (ClassC) |
| 2025-06-22 | 141.101.90.96 (ClassC) |
| 2025-08-19 | 199.60.103.254 (ClassC) |
| 2026-01-03 | 199.60.103.2 (ClassC) |
| Date | Domain | IP |
| portal.sendmarc.com | 2025-04-22 | 104.18.20.187 |
| help.sendmarc.com | 2025-05-21 | 141.101.90.97 |
| academy.sendmarc.com | 2025-01-12 | 172.64.152.97 |