| Date | IP Address |
| 2019-07-29 | 23.200.112.106 (ClassC) |
| 2019-11-20 | 23.34.115.101 (ClassC) |
| 2021-09-02 | 23.203.0.184 (ClassC) |
| 2023-08-25 | 104.103.173.10 (ClassC) |
| 2023-08-25 | 23.47.88.45 (ClassC) |
| 2024-06-18 | 23.34.124.5 (ClassC) |
| 2024-06-25 | 104.81.204.83 (ClassC) |
| 2024-08-16 | 23.47.40.45 (ClassC) |
| 2024-09-19 | 23.50.52.33 (ClassC) |
| 2024-11-02 | 23.50.49.32 (ClassC) |
| 2025-04-14 | 23.50.51.32 (ClassC) |
| 2025-04-20 | 23.50.51.34 (ClassC) |
| 2025-04-30 | 23.50.50.8 (ClassC) |
| 2025-05-11 | 23.50.50.11 (ClassC) |
| 2025-06-19 | 23.50.49.35 (ClassC) |
| 2025-08-20 | 23.50.49.33 (ClassC) |
| 2025-09-10 | 23.50.49.34 (ClassC) |
| 2025-09-20 | 23.50.49.41 (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 |