| Date | IP Address |
| 2021-01-12 | 114.108.139.53 (ClassC) |
| 2026-02-09 | 183.111.161.94 (ClassC) |
| Date | Domain | IP |
| zimbra.sjpnc.co.kr | 2025-10-16 | 183.111.161.94 |
| antispam.sjpnc.co.kr | 2025-10-14 | 183.111.161.94 |
| server.sjpnc.co.kr | 2026-02-09 | 183.111.161.94 |
| gw.sjpnc.co.kr | 2025-10-15 | 183.111.161.94 |
| www.sjpnc.co.kr | 2025-10-14 | 183.111.161.94 |