| Date | IP Address |
| 2023-08-25 | 104.86.253.113 (ClassC) |
| 2024-03-12 | 23.198.111.209 (ClassC) |
| 2024-06-16 | 23.223.223.111 (ClassC) |
| 2024-06-25 | 104.92.255.59 (ClassC) |
| 2024-12-04 | 23.216.145.88 (ClassC) |
| 2025-02-11 | 104.103.68.162 (ClassC) |
| 2025-04-10 | 23.216.147.132 (ClassC) |
| 2025-04-29 | 23.44.175.108 (ClassC) |
| 2025-05-21 | 23.216.147.145 (ClassC) |
| 2025-07-30 | 23.41.4.87 (ClassC) |
| 2025-09-06 | 23.41.4.81 (ClassC) |
| 2025-09-22 | 23.46.17.183 (ClassC) |
| 2025-10-16 | 23.46.17.178 (ClassC) |
| Date | Domain | IP |
| 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 |