| Date | IP Address |
| 2021-04-14 | 96.7.218.107 (ClassC) |
| 2021-04-24 | 104.124.56.163 (ClassC) |
| 2021-08-09 | 209.107.209.176 (ClassC) |
| 2021-08-24 | 23.33.238.89 (ClassC) |
| 2022-05-10 | 96.6.42.115 (ClassC) |
| 2022-05-23 | 104.71.130.16 (ClassC) |
| 2022-05-24 | 23.212.251.137 (ClassC) |
| 2022-05-26 | 96.7.74.32 (ClassC) |
| 2022-05-26 | 96.7.74.57 (ClassC) |
| 2022-06-19 | 72.247.190.56 (ClassC) |
| 2022-07-31 | 23.55.63.185 (ClassC) |
| 2022-08-19 | 23.212.249.16 (ClassC) |
| 2022-10-07 | 23.215.131.91 (ClassC) |
| 2022-10-07 | 66.198.8.145 (ClassC) |
| 2022-11-19 | 23.199.232.140 (ClassC) |
| 2023-12-17 | 216.128.145.32 (ClassC) |
| 2025-04-22 | 103.224.212.210 (ClassC) |
| 2025-07-02 | 52.223.13.41 (ClassC) |
| 2025-08-22 | 77.247.179.89 (ClassC) |
| 2026-02-11 | 216.245.197.44 (ClassC) |
| Date | Domain | IP |
| hl7.sandiegoimmunizationregistry.org | 2024-03-08 | 199.59.243.225 |
| www.sandiegoimmunizationregistry.org | 2026-02-06 | 216.245.197.41 |