| Date | IP Address |
| 2020-02-25 | 23.55.220.43 (ClassC) |
| 2023-08-26 | 104.86.247.242 (ClassC) |
| 2023-12-04 | 23.34.71.205 (ClassC) |
| 2025-04-18 | 23.222.146.3 (ClassC) |
| 2025-09-28 | 23.198.109.141 (ClassC) |
| 2026-01-02 | 23.6.108.227 (ClassC) |
| 2026-01-10 | 184.25.208.139 (ClassC) |
| Date | Domain | IP |
| blog.externaled.hms.harvard.edu | 2025-09-23 | 199.60.103.2 |
| image.email.externaled.hms.harvard.edu | 2023-08-26 | 104.86.247.242 |
| click.email.externaled.hms.harvard.edu | 2026-01-09 | 13.111.151.153 |