| Date | IP Address |
| 2023-08-26 | 104.119.77.83 (ClassC) |
| 2024-03-22 | 23.56.122.89 (ClassC) |
| 2024-07-27 | 23.48.183.70 (ClassC) |
| 2024-12-12 | 23.195.225.36 (ClassC) |
| 2025-03-15 | 23.6.96.221 (ClassC) |
| 2025-04-08 | 23.198.174.145 (ClassC) |
| 2025-04-30 | 23.195.225.45 (ClassC) |
| 2025-08-05 | 88.221.154.243 (ClassC) |
| Date | Domain | IP |
| www.staging.vaccines.gov | 2025-04-23 | 198.246.106.49 |
| origin.vaccines.gov | 2025-02-05 | 198.246.102.49 |
| wwwns.vaccines.gov | 2023-08-26 | 104.119.77.83 |
| www.vaccines.gov | 2014-11-10 | 207.152.124.34 |