| Date | IP Address |
| 2019-05-23 | 23.219.36.8 (ClassC) |
| 2019-06-06 | 23.215.15.118 (ClassC) |
| 2019-08-16 | 23.43.164.8 (ClassC) |
| 2020-01-09 | 96.7.75.200 (ClassC) |
| 2022-02-28 | 23.52.42.166 (ClassC) |
| 2023-03-15 | 23.193.200.138 (ClassC) |
| 2024-06-20 | 23.41.4.91 (ClassC) |
| 2025-05-14 | 23.216.147.138 (ClassC) |
| 2025-09-15 | 23.41.4.76 (ClassC) |
| 2026-02-13 | 23.41.4.87 (ClassC) |
| Date | Domain | IP |
| auth.yamaguchibank.co.jp | 2025-12-22 | 52.195.94.43 |
| direct.tos.yamaguchibank.co.jp | 2025-10-03 | 210.197.64.176 |
| authtest.yamaguchibank.co.jp | 2025-09-14 | 57.182.128.125 |
| www.yamaguchibank.co.jp | 2024-06-20 | 23.41.4.91 |