| 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) |
| 2024-11-07 | 23.6.108.227 (ClassC) |
| Date | Domain | IP |
| blog.externaled.hms.harvard.edu | 2024-07-20 | 199.60.103.2 |
| image.email.externaled.hms.harvard.edu | 2023-08-26 | 104.86.247.242 |
| click.email.externaled.hms.harvard.edu | 2024-11-07 | 13.111.151.153 |