| Date | IP Address |
| 2014-11-05 | 207.211.62.160 (ClassC) |
| 2025-05-14 | 198.246.106.49 (ClassC) |
| 2026-02-28 | 198.246.102.49 (ClassC) |
| Date | Domain | IP |
| www.staging.vaccines.gov | 2025-04-23 | 198.246.106.49 |
| origin.vaccines.gov | 2025-12-02 | 198.246.102.49 |
| wwwns.vaccines.gov | 2023-08-26 | 104.119.77.83 |
| www.vaccines.gov | 2014-11-10 | 207.152.124.34 |