| Date | IP Address |
| 2013-09-18 | 81.91.86.12 (ClassC) |
| 2025-06-03 | 81.91.86.19 (ClassC) |
| Date | Domain | IP |
| NS2.WEB4U.CZ | 2025-05-24 | 85.207.53.12 |
| php53.web4u.cz | 2024-09-19 | 81.91.86.12 |
| lg.web4u.cz | 2025-05-26 | 85.207.4.39 |
| mail.web4u.cz | 2025-02-27 | 81.91.87.10 |
| debian.mirror.web4u.cz | 2025-02-27 | 81.91.81.11 |
| ns.web4u.cz | 2025-05-11 | 185.14.224.241 |
| default.web4u.cz | 2025-03-15 | 81.91.86.11 |
| www.web4u.cz | 2025-02-25 | 81.91.86.19 |
| diamond-box.web4u.cz | 2025-02-27 | 81.91.86.11 |
| tkab-cz.web4u.cz | 2025-02-17 | 81.91.86.11 |