| Date | IP Address |
| 2021-01-15 | 23.38.128.241 (ClassC) |
| 2023-08-25 | 104.86.228.28 (ClassC) |
| 2024-12-17 | 23.196.195.131 (ClassC) |
| 2025-04-30 | 23.223.220.114 (ClassC) |
| 2025-09-25 | 23.202.205.145 (ClassC) |
| Date | Domain | IP |
| ts8.northerntrustopen.com | 2023-08-25 | 23.74.138.145 |
| m.northerntrustopen.com | 2023-08-25 | 104.86.228.28 |
| www.northerntrustopen.com | 2014-07-17 | 165.254.24.136 |