| Date | IP Address |
| 2024-04-13 | 52.200.81.171 (ClassC) |
| 2024-05-02 | 50.17.50.50 (ClassC) |
| 2024-10-04 | 3.222.170.13 (ClassC) |
| 2024-11-25 | 34.194.254.248 (ClassC) |
| 2025-01-23 | 3.219.108.75 (ClassC) |
| 2025-05-13 | 98.85.53.49 (ClassC) |
| 2025-05-16 | 44.197.135.54 (ClassC) |
| 2025-08-10 | 3.225.87.111 (ClassC) |
| 2025-08-21 | 3.223.42.16 (ClassC) |
| 2025-08-24 | 52.204.58.21 (ClassC) |
| 2025-09-11 | 3.213.22.176 (ClassC) |
| 2025-12-02 | 3.224.112.223 (ClassC) |
| Date | Domain | IP |
| pass-thru-tester-lab.fasttax.com | 2024-04-13 | 52.200.81.171 |
| gosystemrslab.fasttax.com | 2024-04-13 | 35.172.127.160 |
| insourceexpresslab.fasttax.com | 2024-04-13 | 52.200.81.171 |
| rs-gosyswsvc.fasttax.com | 2024-04-13 | 52.200.81.171 |
| gosystemrspd.fasttax.com | 2025-08-24 | 34.233.254.161 |
| maintenance.fasttax.com | 2025-09-18 | 155.46.172.126 |
| gosystemrslab-ciam.fasttax.com | 2024-04-13 | 35.172.127.160 |
| gosystemrs.fasttax.com | 2025-03-27 | 3.224.246.59 |
| gosystemrssat.fasttax.com | 2025-05-14 | 34.233.254.161 |
| sat-gosystempt.fasttax.com | 2024-04-13 | 34.203.130.96 |
| gosystemrstbb-devcicdtest.fasttax.com | 2024-04-13 | 35.172.127.160 |
| gosystemrsdevcicdtest.fasttax.com | 2024-04-13 | 35.172.127.160 |
| gosystemrsdev.fasttax.com | 2024-04-13 | 3.88.246.220 |
| www.fasttax.com | 2025-09-16 | 155.46.172.254 |