| Date | IP Address |
| 2022-05-30 | 184.31.72.84 (ClassC) |
| 2023-08-25 | 104.86.254.184 (ClassC) |
| 2023-12-27 | 184.25.210.59 (ClassC) |
| 2024-06-23 | 23.6.110.10 (ClassC) |
| 2024-08-11 | 184.30.94.70 (ClassC) |
| 2024-11-08 | 23.64.119.54 (ClassC) |
| 2025-04-17 | 23.41.4.86 (ClassC) |
| 2025-07-22 | 23.41.4.77 (ClassC) |
| 2025-11-08 | 23.216.145.80 (ClassC) |
| 2025-12-14 | 23.216.147.130 (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 |