| Date | IP Address |
| 2023-08-25 | 23.198.174.29 (ClassC) |
| 2025-12-24 | 23.54.33.235 (ClassC) |
| 2026-02-21 | 23.209.24.244 (ClassC) |
| Date | Domain | IP |
| image.email.costar.co.uk | 2025-04-01 | 23.32.75.4 |
| www-tsm.costar.co.uk | 2024-06-28 | 23.46.17.36 |
| www-dvm.costar.co.uk | 2024-09-21 | 104.98.114.177 |
| www-tsr.costar.co.uk | 2024-07-24 | 23.46.17.36 |
| wwwtest.costar.co.uk | 2023-08-25 | 23.198.174.29 |
| www.costar.co.uk | 2023-08-26 | 104.100.64.151 |