| Date | IP Address |
| 2023-08-25 | 104.85.171.129 (ClassC) |
| 2023-12-26 | 104.103.122.42 (ClassC) |
| 2024-06-18 | 23.209.30.236 (ClassC) |
| 2024-07-07 | 23.213.20.112 (ClassC) |
| 2024-08-31 | 23.192.230.90 (ClassC) |
| 2025-07-11 | 23.41.4.72 (ClassC) |
| 2025-10-12 | 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 |