| Date | IP Address |
| 2024-04-13 | 3.88.246.220 (ClassC) |
| 2024-04-29 | 3.216.21.100 (ClassC) |
| 2024-11-24 | 100.24.189.249 (ClassC) |
| 2025-04-04 | 54.152.47.130 (ClassC) |
| 2025-08-05 | 23.22.107.34 (ClassC) |
| 2025-09-19 | 52.21.46.97 (ClassC) |
| 2025-12-14 | 54.175.11.25 (ClassC) |
| 2026-01-26 | 52.54.224.150 (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 | 2026-01-06 | 155.46.172.126 |
| gosystemrslab-ciam.fasttax.com | 2024-04-13 | 35.172.127.160 |
| gosystemrs.fasttax.com | 2025-12-15 | 3.224.246.59 |
| gosystemrssat.fasttax.com | 2026-01-02 | 35.174.121.218 |
| 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 | 2025-12-14 | 155.46.172.254 |