| Date | IP Address |
| 2023-08-25 | 104.86.236.188 (ClassC) |
| 2024-07-02 | 23.6.100.243 (ClassC) |
| 2025-03-13 | 23.216.147.131 (ClassC) |
| 2025-05-13 | 23.41.4.90 (ClassC) |
| 2025-05-22 | 104.103.68.177 (ClassC) |
| 2025-08-08 | 23.41.4.88 (ClassC) |
| 2025-09-08 | 23.41.4.68 (ClassC) |
| 2025-09-18 | 23.46.17.186 (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 |