| Date | IP Address |
| 2019-12-09 | 59.106.13.87 (ClassC) |
| 2024-07-17 | 172.67.220.61 (ClassC) |
| 2024-07-21 | 104.21.62.48 (ClassC) |
| 2025-01-02 | 38.38.194.165 (ClassC) |
| Date | Domain | IP |
| mail.yamatoyakikaku.com | 2025-01-02 | 38.38.194.165 |
| www.yamatoyakikaku.com | 2024-08-19 | 172.67.220.61 |