| Date | IP Address |
| 2023-08-25 | 104.85.171.129 (ClassC) |
| 2024-02-23 | 104.89.229.32 (ClassC) |
| 2024-03-19 | 23.202.201.217 (ClassC) |
| 2024-03-26 | 184.27.153.163 (ClassC) |
| 2024-07-25 | 23.213.20.112 (ClassC) |
| 2024-08-26 | 23.209.30.236 (ClassC) |
| 2025-02-06 | 23.210.26.43 (ClassC) |
| 2025-03-18 | 23.41.4.8 (ClassC) |
| 2025-12-05 | 23.41.4.72 (ClassC) |
| 2025-12-09 | 23.216.147.209 (ClassC) |
| 2026-01-09 | 23.59.88.236 (ClassC) |
| 2026-01-19 | 23.41.4.70 (ClassC) |
| Date | Domain | IP |
| apps2.irs.gov | 2014-05-11 | 198.47.108.64 |
| la1.www4.irs.gov | 2023-08-25 | 104.86.253.111 |
| sa1.www4.irs.gov | 2023-08-25 | 104.86.253.151 |
| la2.www4.irs.gov | 2023-08-25 | 104.86.253.111 |
| sa2.www4.irs.gov | 2023-08-25 | 104.86.253.151 |
| la3.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| sa3.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| la4.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| sa4.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| la.www4.irs.gov | 2023-08-25 | 104.86.253.111 |