| Property | Value |
| mail-abuse@cert.br |
| Date | IP Address |
| 2013-06-29 | 209.235.2.50 (ClassC) |
| 2015-08-10 | 165.160.15.20 (ClassC) |
| 2015-08-14 | 165.160.13.20 (ClassC) |
| 2019-12-06 | 54.77.114.145 (ClassC) |
| 2024-11-07 | 104.16.77.72 (ClassC) |
| 2024-12-04 | 104.16.78.72 (ClassC) |
| 2025-01-09 | 104.18.11.139 (ClassC) |
| 2025-01-17 | 104.18.10.139 (ClassC) |
| Date | Domain | IP |
| bc.ef.com.br | 2022-03-01 | 108.156.120.114 |
| m.ef.com.br | 2013-04-20 | 200.123.198.168 |
| www.ef.com.br | 2015-01-09 | 173.205.10.49 |