| Date | IP Address |
| 2024-04-13 | 35.172.127.160 (ClassC) |
| 2024-04-29 | 50.17.50.50 (ClassC) |
| 2024-08-20 | 3.223.159.113 (ClassC) |
| 2024-10-04 | 3.222.170.13 (ClassC) |
| 2024-11-25 | 34.194.254.248 (ClassC) |
| 2025-05-07 | 54.210.66.33 (ClassC) |
| 2025-05-21 | 54.204.187.8 (ClassC) |
| 2025-07-02 | 13.216.139.103 (ClassC) |
| 2025-08-01 | 34.196.94.95 (ClassC) |
| 2025-08-05 | 3.225.87.111 (ClassC) |
| 2025-08-21 | 3.223.42.16 (ClassC) |
| 2025-09-20 | 52.5.249.124 (ClassC) |
| 2025-12-05 | 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 |