| Date | IP Address |
| 2022-05-16 | 23.66.180.65 (ClassC) |
| 2022-09-02 | 23.52.11.181 (ClassC) |
| 2022-10-06 | 23.11.14.155 (ClassC) |
| 2023-01-15 | 23.194.158.13 (ClassC) |
| 2023-08-25 | 23.66.71.84 (ClassC) |
| 2023-08-25 | 104.85.171.129 (ClassC) |
| 2023-10-26 | 104.98.70.153 (ClassC) |
| 2023-12-27 | 104.103.122.42 (ClassC) |
| 2024-02-01 | 23.10.200.118 (ClassC) |
| 2024-02-21 | 23.43.200.116 (ClassC) |
| 2024-04-02 | 23.33.249.143 (ClassC) |
| 2024-06-01 | 23.209.30.236 (ClassC) |
| 2024-06-25 | 23.198.70.235 (ClassC) |
| 2024-07-07 | 23.213.20.112 (ClassC) |
| 2025-01-23 | 23.59.88.198 (ClassC) |
| 2025-04-10 | 23.41.4.8 (ClassC) |
| 2025-04-14 | 23.215.11.240 (ClassC) |
| 2025-04-14 | 23.215.11.242 (ClassC) |
| 2025-09-23 | 23.41.4.72 (ClassC) |
| 2025-12-02 | 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 |