| Date | IP Address |
| 2016-02-15 | 79.125.18.103 (ClassC) |
| 2017-05-07 | 52.211.104.32 (ClassC) |
| 2023-08-18 | 52.16.255.191 (ClassC) |
| 2024-02-27 | 34.254.36.128 (ClassC) |
| 2024-06-30 | 54.171.225.239 (ClassC) |
| 2024-09-15 | 52.17.96.50 (ClassC) |
| 2025-01-22 | 52.212.7.198 (ClassC) |
| Date | Domain | IP |
| ns1.is4u.cz | 2024-06-30 | 79.125.21.172 |
| ns2.is4u.cz | 2025-01-09 | 212.4.158.8 |
| www.is4u.cz | 2023-08-18 | 52.16.255.191 |
| static.www.is4u.cz | 2024-08-25 | 54.75.175.79 |