| Date | IP Address |
| 2012-02-18 | 50.56.57.77 (ClassC) |
| 2022-06-21 | 52.4.163.136 (ClassC) |
| 2023-08-26 | 54.145.74.128 (ClassC) |
| 2026-03-06 | 104.248.111.59 (ClassC) |
| Date | Domain | IP |
| encyclopedia.chicagohistory.org | 2026-03-02 | 98.90.139.198 |
| photostore.chicagohistory.org | 2014-03-04 | 96.6.46.82 |