| 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) |
| 2025-03-30 | 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) |
| 2025-07-14 | 23.41.4.72 (ClassC) |
| 2025-07-31 | 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 |
| 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 | 2025-07-31 | 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 | 2025-06-11 | 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 |
| cloudapps1.perf.irs.gov | 2023-08-25 | 104.86.225.193 |