| Date | IP Address |
| 2026-01-18 | 20.75.106.128 (ClassC) |
| Date | Domain | IP |
| kaiser.flexorx.optum.com | 2026-01-13 | 20.75.106.128 |
| portalapi.kaiser.flexorx.optum.com | 2025-05-27 | 20.75.106.128 |
| portal.kaiser.flexorx.optum.com | 2026-01-13 | 20.75.106.128 |
| fhir.kaiser.flexorx.optum.com | 2026-01-18 | 20.75.106.128 |
| api.fhir.kaiser.flexorx.optum.com | 2023-08-26 | 40.67.156.45 |
| authz.kaiser.flexorx.optum.com | 2026-01-13 | 20.75.106.128 |
| api.authz.kaiser.flexorx.optum.com | 2024-01-07 | 20.96.79.238 |