| Date | IP Address |
| 2018-08-28 | 50.19.100.124 (ClassC) |
| 2018-08-28 | 54.243.244.128 (ClassC) |
| 2018-08-28 | 54.225.158.84 (ClassC) |
| 2019-09-13 | 54.235.197.225 (ClassC) |
| 2019-09-13 | 54.235.89.61 (ClassC) |
| 2019-10-23 | 34.200.41.212 (ClassC) |
| 2019-10-23 | 52.54.128.57 (ClassC) |
| 2020-02-27 | 3.125.200.158 (ClassC) |
| 2020-02-27 | 3.125.161.174 (ClassC) |
| 2021-07-30 | 18.194.225.1 (ClassC) |
| 2025-10-07 | 146.75.42.191 (ClassC) |
| 2026-02-14 | 151.101.22.191 (ClassC) |
| Date | Domain | IP |
| agent-pos-na1.fourth.com | 2023-08-15 | 35.169.168.134 |
| gateway.analytics.na1.fourth.com | 2024-01-31 | 40.79.87.138 |
| hs-labor-dashboard.fourth.com | 2026-01-07 | 100.23.31.8 |
| developer.fourth.com | 2020-02-27 | 3.125.161.174 |
| developers.fourth.com | 2025-04-29 | 151.101.22.191 |
| salesloft.fourth.com | 2025-12-19 | 54.243.116.1 |
| www.fourth.com | 2025-06-03 | 141.193.213.10 |