| Date | IP Address |
| 2022-07-25 | 104.112.202.31 (ClassC) |
| 2022-07-26 | 23.66.64.61 (ClassC) |
| 2022-08-23 | 23.64.247.180 (ClassC) |
| 2022-09-13 | 23.11.30.58 (ClassC) |
| 2023-04-05 | 23.194.158.22 (ClassC) |
| 2023-08-25 | 104.86.236.188 (ClassC) |
| 2023-11-27 | 184.30.85.136 (ClassC) |
| 2023-12-27 | 184.86.204.250 (ClassC) |
| 2024-03-13 | 104.100.59.47 (ClassC) |
| 2024-03-20 | 184.25.189.43 (ClassC) |
| 2024-09-13 | 23.222.241.84 (ClassC) |
| 2024-09-13 | 23.222.241.89 (ClassC) |
| 2024-10-29 | 23.44.175.108 (ClassC) |
| 2024-11-01 | 23.44.175.113 (ClassC) |
| 2025-02-06 | 23.62.33.168 (ClassC) |
| 2025-02-06 | 23.62.33.169 (ClassC) |
| 2025-04-15 | 23.219.78.136 (ClassC) |
| 2025-06-15 | 23.46.23.149 (ClassC) |
| 2025-06-15 | 23.46.23.148 (ClassC) |
| 2025-07-16 | 23.216.147.138 (ClassC) |
| 2025-10-03 | 23.46.17.186 (ClassC) |
| 2026-02-08 | 23.41.4.68 (ClassC) |
| 2026-02-20 | 23.41.4.88 (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 |