| Date | IP Address |
| 2023-08-25 | 104.86.253.111 (ClassC) |
| 2024-03-20 | 23.196.113.88 (ClassC) |
| 2024-06-22 | 104.92.255.55 (ClassC) |
| 2024-07-07 | 23.223.223.107 (ClassC) |
| 2024-09-07 | 23.45.46.235 (ClassC) |
| 2024-10-16 | 23.220.144.137 (ClassC) |
| 2024-10-25 | 23.221.22.115 (ClassC) |
| 2024-12-18 | 23.45.46.17 (ClassC) |
| 2025-03-24 | 184.28.194.32 (ClassC) |
| 2025-05-16 | 23.44.175.119 (ClassC) |
| 2025-06-11 | 23.41.4.89 (ClassC) |
| 2025-07-10 | 23.41.4.83 (ClassC) |
| 2025-09-11 | 23.210.244.151 (ClassC) |
| 2025-09-20 | 23.46.17.179 (ClassC) |
| 2025-10-19 | 23.46.17.190 (ClassC) |
| 2025-12-04 | 23.41.4.81 (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 |