| Date | IP Address |
| 2021-03-23 | 52.84.127.83 (ClassC) |
| 2025-08-01 | 161.80.73.54 (ClassC) |
| Date | Domain | IP |
| dcns2.epa.gov | 2025-07-16 | 161.80.212.15 |
| www2.epa.gov | 2014-06-27 | 63.216.54.253 |
| www3.epa.gov | 2025-07-18 | 134.67.21.34 |
| data.epa.gov | 2025-08-01 | 161.80.73.54 |
| beta.epa.gov | 2023-08-25 | 18.161.6.115 |
| archive.epa.gov | 2025-07-14 | 134.67.21.34 |
| blog.epa.gov | 2019-04-11 | 13.249.142.11 |
| espanol.epa.gov | 2024-06-23 | 3.163.24.60 |
| awsrobinson.epa.gov | 2025-07-16 | 204.47.252.52 |
| bap.epa.gov | 2024-06-06 | 23.44.175.190 |
| developer.epa.gov | 2019-09-06 | 13.224.227.55 |
| water.epa.gov | 2015-03-21 | 63.236.252.171 |
| energystar.prod.es.epa.gov | 2025-07-25 | 204.47.252.17 |
| snapshot.epa.gov | 2025-04-12 | 134.67.21.34 |
| 19january2021snapshot.epa.gov | 2025-07-18 | 134.67.21.34 |
| cleanairnortheast.epa.gov | 2025-07-25 | 134.67.21.34 |
| lew.epa.gov | 2025-01-05 | 15.200.211.21 |
| www.epa.gov | 2024-07-14 | 18.161.6.51 |