| Date | IP Address |
| 2021-04-28 | 13.249.64.100 (ClassC) |
| 2021-09-30 | 65.8.158.38 (ClassC) |
| 2024-06-12 | 3.163.24.90 (ClassC) |
| 2024-07-07 | 99.84.66.21 (ClassC) |
| 2024-07-23 | 99.84.66.81 (ClassC) |
| 2024-07-30 | 99.84.66.23 (ClassC) |
| 2024-08-23 | 18.161.6.96 (ClassC) |
| 2025-04-30 | 3.175.34.27 (ClassC) |
| 2025-05-30 | 52.84.162.51 (ClassC) |
| 2025-07-01 | 3.175.34.66 (ClassC) |
| 2025-07-09 | 3.175.34.11 (ClassC) |
| 2025-08-10 | 3.175.34.107 (ClassC) |
| Date | Domain | IP |
| vaccine.cookcountyil.gov | 2021-10-10 | 13.225.229.121 |
| assessorpropertydetails-stg.cookcountyil.gov | 2025-08-08 | 66.22.14.111 |
| stage-drupal.cookcountyil.gov | 2024-04-20 | 204.246.191.50 |
| archive-drupal.cookcountyil.gov | 2024-08-21 | 18.161.6.79 |
| analytics.cookcountyil.gov | 2025-08-04 | 52.217.111.43 |
| opendocs.cookcountyil.gov | 2024-06-12 | 3.163.24.90 |
| assessorpropertydetails.cookcountyil.gov | 2025-01-21 | 66.22.14.78 |
| www.cookcountyil.gov | 2019-10-25 | 13.32.255.188 |