| Date | IP Address |
| 2019-09-06 | 23.4.122.3 (ClassC) |
| 2023-08-25 | 104.86.227.206 (ClassC) |
| 2023-12-26 | 104.112.169.147 (ClassC) |
| 2024-02-21 | 104.92.251.161 (ClassC) |
| 2024-04-12 | 23.213.23.225 (ClassC) |
| 2024-07-07 | 23.196.193.251 (ClassC) |
| 2025-02-12 | 23.213.53.52 (ClassC) |
| 2025-03-29 | 184.28.194.26 (ClassC) |
| 2025-03-30 | 23.216.145.74 (ClassC) |
| 2025-04-09 | 23.216.147.140 (ClassC) |
| 2025-04-20 | 23.46.17.178 (ClassC) |
| 2025-05-30 | 23.41.4.68 (ClassC) |
| 2025-08-12 | 23.216.147.145 (ClassC) |
| 2025-09-07 | 23.41.4.72 (ClassC) |
| 2025-09-24 | 23.46.17.193 (ClassC) |
| 2026-01-29 | 23.41.4.79 (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 |