| Date | IP Address |
| 2023-08-26 | 23.47.88.45 (ClassC) |
| 2024-07-07 | 23.34.124.5 (ClassC) |
| 2024-09-19 | 23.50.50.17 (ClassC) |
| 2025-04-13 | 23.50.50.8 (ClassC) |
| 2025-05-19 | 23.50.50.11 (ClassC) |
| 2025-06-07 | 23.50.49.41 (ClassC) |
| 2025-07-05 | 23.50.49.35 (ClassC) |
| 2026-02-25 | 23.50.49.40 (ClassC) |
| Date | Domain | IP |
| eitc.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| www.eitc.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| efile.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| freefile.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| forms.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| apps.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| marketingexpress.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| www.marketingexpress.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| www.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |