| Date | IP Address |
| 2023-08-25 | 104.85.171.129 (ClassC) |
| 2024-02-23 | 104.89.229.32 (ClassC) |
| 2024-03-19 | 23.202.201.217 (ClassC) |
| 2024-03-26 | 184.27.153.163 (ClassC) |
| 2024-07-25 | 23.213.20.112 (ClassC) |
| 2024-08-26 | 23.209.30.236 (ClassC) |
| 2025-02-06 | 23.210.26.43 (ClassC) |
| 2025-03-18 | 23.41.4.8 (ClassC) |
| 2025-08-15 | 23.41.4.72 (ClassC) |
| 2025-08-27 | 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 |
| sa.www4.irs.gov | 2023-08-25 | 104.86.253.151 |
| lapete.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| sapete.www4.irs.gov | 2023-08-26 | 104.86.236.188 |
| apipete.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| laeite.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| saeite.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| apieite.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| laalteite.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| saalteite.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| apialteite.www4.irs.gov | 2023-08-25 | 104.86.236.188 |
| api.www4.irs.gov | 2023-08-25 | 104.86.253.111 |
| la-iep.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| sa-iep.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| la.alt-iep.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| la1.alt.www4.irs.gov | 2023-08-25 | 104.86.253.113 |
| la2.alt.www4.irs.gov | 2023-08-25 | 104.86.253.113 |
| la.alt.www4.irs.gov | 2023-08-25 | 104.86.253.113 |
| api.alt.www4.irs.gov | 2023-08-25 | 104.86.253.113 |
| emg6.irs.gov | 2025-08-03 | 152.216.11.142 |
| eitc.irs.gov | 2023-08-25 | 104.86.227.206 |
| trainingc.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| poc.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| trainingd.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| prod.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| pete.edit.eitc.irs.gov | 2023-08-25 | 23.5.254.84 |
| eite.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| bat.edit.eitc.irs.gov | 2023-08-25 | 23.5.254.84 |
| sit.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| dmesit.edit.eitc.irs.gov | 2023-08-25 | 23.5.254.84 |
| pmaint.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| dev.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| dmedev.edit.eitc.irs.gov | 2023-08-25 | 104.86.254.184 |
| www.pmaint.eitc.irs.gov | 2023-08-25 | 23.5.254.84 |
| www.eitc.irs.gov | 2023-08-25 | 104.86.227.206 |
| find.irs.gov | 2024-11-25 | 54.86.75.48 |
| efile.irs.gov | 2023-08-25 | 104.86.227.206 |
| freefile.irs.gov | 2023-09-29 | 104.86.227.206 |
| taxpayeradvocate.irs.gov | 2025-08-13 | 152.216.7.102 |
| www.taxpayeradvocate.irs.gov | 2025-05-26 | 18.233.184.64 |
| perf.irs.gov | 2023-08-25 | 104.85.171.129 |