| Date | IP Address |
| 2023-08-25 | 104.86.254.184 (ClassC) |
| 2023-12-26 | 23.222.147.20 (ClassC) |
| 2024-06-22 | 23.6.110.10 (ClassC) |
| 2024-10-05 | 23.219.78.136 (ClassC) |
| 2024-10-16 | 23.64.119.54 (ClassC) |
| 2025-03-03 | 23.64.114.138 (ClassC) |
| 2025-04-05 | 23.41.4.86 (ClassC) |
| 2025-06-19 | 23.213.53.76 (ClassC) |
| 2025-08-15 | 23.45.46.10 (ClassC) |
| 2025-08-15 | 23.45.46.17 (ClassC) |
| 2025-10-12 | 23.46.17.186 (ClassC) |
| 2026-03-07 | 23.41.4.77 (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 |