| Date | IP Address |
| 2015-03-11 | 173.205.10.17 (ClassC) |
| 2018-04-10 | 23.4.122.3 (ClassC) |
| 2023-07-15 | 23.37.107.40 (ClassC) |
| 2023-08-25 | 104.86.227.206 (ClassC) |
| 2024-04-20 | 23.202.198.7 (ClassC) |
| 2024-05-31 | 104.92.251.161 (ClassC) |
| 2024-07-30 | 104.103.208.9 (ClassC) |
| 2024-10-05 | 23.54.19.91 (ClassC) |
| 2024-10-13 | 23.54.18.250 (ClassC) |
| 2024-11-25 | 23.41.4.79 (ClassC) |
| 2024-12-14 | 23.41.4.72 (ClassC) |
| 2025-05-16 | 104.100.168.146 (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 | 2025-05-02 | 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 | 2025-04-30 | 152.216.11.102 |
| perf.irs.gov | 2023-08-25 | 104.85.171.129 |
| cloudapps1.perf.irs.gov | 2023-08-25 | 104.86.225.193 |
| cloudapps2.perf.irs.gov | 2023-08-25 | 104.85.171.129 |
| cloudapps3.perf.irs.gov | 2023-08-25 | 104.86.225.193 |
| cloudapps4.perf.irs.gov | 2024-06-18 | 23.209.30.236 |
| eitc.perf.irs.gov | 2023-08-25 | 104.86.225.193 |
| www.eitc.perf.irs.gov | 2023-08-25 | 23.55.216.90 |
| efile.perf.irs.gov | 2023-08-25 | 104.85.171.129 |
| freefile.perf.irs.gov | 2023-08-25 | 23.55.216.90 |
| forms.perf.irs.gov | 2023-08-25 | 23.55.216.90 |
| apps.perf.irs.gov | 2023-08-25 | 23.55.216.90 |
| cloudapps.perf.irs.gov | 2023-08-25 | 104.85.171.129 |
| marketingexpress.perf.irs.gov | 2023-08-25 | 104.86.225.193 |
| www.marketingexpress.perf.irs.gov | 2023-08-25 | 104.86.225.193 |
| www.perf.irs.gov | 2023-08-25 | 23.55.216.90 |
| perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| eitc.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| www.eitc.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| efile.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| freefile.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| forms.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| apps.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| marketingexpress.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| www.marketingexpress.perfstaging.irs.gov | 2023-08-26 | 23.47.88.45 |
| www.perfstaging.irs.gov | 2023-08-25 | 23.47.88.45 |
| search.irs.gov | 2015-02-08 | 198.173.2.9 |
| taxmap.irs.gov | 2019-06-15 | 13.32.255.160 |