| Date | IP Address |
| 2022-06-17 | 184.31.72.84 (ClassC) |
| 2023-08-25 | 104.86.254.184 (ClassC) |
| 2024-12-09 | 23.41.4.77 (ClassC) |
| 2025-06-10 | 23.41.4.86 (ClassC) |
| 2025-11-28 | 23.194.127.72 (ClassC) |
| 2026-01-25 | 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 |