| Date | IP Address |
| 2023-08-25 | 104.85.171.129 (ClassC) |
| 2023-12-24 | 104.89.229.32 (ClassC) |
| 2024-06-01 | 23.209.30.236 (ClassC) |
| 2024-06-18 | 23.213.20.112 (ClassC) |
| 2024-09-19 | 23.54.18.241 (ClassC) |
| 2025-04-20 | 23.202.47.65 (ClassC) |
| 2025-04-30 | 23.41.4.83 (ClassC) |
| 2025-05-09 | 23.55.167.25 (ClassC) |
| 2025-06-17 | 23.59.88.203 (ClassC) |
| 2025-08-29 | 23.41.4.70 (ClassC) |
| 2025-10-23 | 23.41.4.72 (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 |