| Date | IP Address |
| 2020-08-26 | 99.84.248.51 (ClassC) |
| 2020-08-26 | 99.84.248.9 (ClassC) |
| 2020-08-26 | 99.84.248.117 (ClassC) |
| 2024-07-05 | 18.161.6.63 (ClassC) |
| 2025-01-09 | 3.163.165.28 (ClassC) |
| 2025-05-13 | 3.175.34.116 (ClassC) |
| Date | Domain | IP |
| ws-green.exp1.ef-cms.ustaxcourt.gov | 2024-05-14 | 52.9.95.10 |
| api-blue.exp2.ef-cms.ustaxcourt.gov | 2024-04-23 | 54.241.160.218 |
| app.mig.ef-cms.ustaxcourt.gov | 2024-07-02 | 204.246.191.5 |
| api-blue.stg.ef-cms.ustaxcourt.gov | 2023-08-31 | 54.177.143.87 |
| api.stg.ef-cms.ustaxcourt.gov | 2024-06-09 | 54.177.169.119 |
| public-api-green.stg.ef-cms.ustaxcourt.gov | 2025-04-05 | 52.9.6.85 |
| app.stg.ef-cms.ustaxcourt.gov | 2024-11-05 | 18.161.6.77 |
| api-blue.irs.ef-cms.ustaxcourt.gov | 2024-08-08 | 54.215.1.183 |
| public-api-blue.irs.ef-cms.ustaxcourt.gov | 2024-03-20 | 54.177.24.235 |
| api.irs.ef-cms.ustaxcourt.gov | 2024-12-27 | 50.18.42.229 |
| app.irs.ef-cms.ustaxcourt.gov | 2024-07-05 | 18.161.6.63 |
| api-blue.dev.ef-cms.ustaxcourt.gov | 2024-04-18 | 54.215.151.172 |
| api.dev.ef-cms.ustaxcourt.gov | 2024-12-27 | 54.67.80.60 |
| public-api.dev.ef-cms.ustaxcourt.gov | 2024-07-22 | 54.241.131.120 |
| app.dev.ef-cms.ustaxcourt.gov | 2024-01-13 | 204.246.191.111 |