| Property | Value |
| Organization | Signum International S.a r.l Luxembourg Luzern Branch |
| domainadmintl@ef.com | |
| NameServer | ns2.domainnetwork.se |
| Date | IP Address |
| 2020-02-14 | 23.43.164.98 (ClassC) |
| 2020-07-07 | 23.42.158.145 (ClassC) |
| 2020-12-29 | 23.42.158.176 (ClassC) |
| 2021-03-27 | 104.88.204.64 (ClassC) |
| 2022-06-18 | 23.56.175.24 (ClassC) |
| 2024-03-11 | 184.28.93.19 (ClassC) |
| 2024-08-16 | 23.44.175.150 (ClassC) |
| 2025-04-19 | 23.55.111.155 (ClassC) |
| 2025-04-25 | 23.55.167.34 (ClassC) |
| 2025-12-19 | 23.192.230.143 (ClassC) |
| 2026-01-03 | 23.192.230.133 (ClassC) |
| Date | Domain | IP |
| bc.ef.com.cn | 2022-04-17 | 108.156.120.114 |
| qa.learn.corporate.ef.com.cn | 2025-07-18 | 81.69.87.79 |
| liuxue.ef.com.cn | 2014-06-25 | 69.31.57.218 |
| school.englishlive.ef.com.cn | 2025-11-30 | 155.102.54.146 |
| lesson-player.ef.studio.ef.com.cn | 2025-11-22 | 155.102.54.147 |
| help.ef.com.cn | 2024-03-11 | 184.28.93.19 |
| classes.ef.com.cn | 2025-10-09 | 118.193.97.157 |
| careers.ef.com.cn | 2025-09-13 | 27.128.219.107 |
| myaccount.ef.com.cn | 2025-10-06 | 118.193.97.204 |
| www.ef.com.cn | 2025-12-19 | 27.128.219.99 |