| Date | IP Address |
| 2016-05-30 | 159.53.60.93 (ClassC) |
| 2024-07-02 | 23.198.6.12 (ClassC) |
| 2024-11-15 | 23.64.119.185 (ClassC) |
| 2024-11-25 | 23.46.17.64 (ClassC) |
| 2024-12-29 | 23.46.228.169 (ClassC) |
| 2025-03-03 | 23.46.228.171 (ClassC) |
| 2025-09-10 | 23.216.147.200 (ClassC) |
| 2025-09-14 | 23.216.147.203 (ClassC) |
| 2026-02-09 | 23.216.147.169 (ClassC) |
| Date | Domain | IP |
| specialcdc1.firstusa.com | 2025-02-26 | 146.143.70.138 |
| specialcdc2.firstusa.com | 2024-12-29 | 146.143.134.138 |
| specialrdc.firstusa.com | 2025-02-25 | 146.143.70.138 |
| businesscard.firstusa.com | 2024-11-24 | 23.46.17.57 |
| cardmemberservice.firstusa.com | 2024-11-25 | 23.46.17.51 |
| online.firstusa.com | 2024-11-24 | 23.46.17.40 |
| app.firstusa.com | 2023-08-16 | 159.53.60.93 |
| cardmemberservices.firstusa.com | 2024-11-25 | 23.46.17.64 |