| Date | IP Address |
| 2021-02-27 | 35.197.249.2 (ClassC) |
| 2025-02-08 | 104.21.80.1 (ClassC) |
| 2025-04-23 | 104.21.96.1 (ClassC) |
| 2025-12-21 | 172.67.139.163 (ClassC) |
| 2026-02-13 | 104.21.33.13 (ClassC) |
| Date | Domain | IP |
| mail1.quadrangle.com | 2024-08-21 | 104.21.33.13 |
| ms1.quadrangle.com | 2024-10-03 | 172.67.139.163 |
| quadrangle-nyc-sw2960-dirty2.quadrangle.com | 2024-07-30 | 104.21.33.13 |
| pop3.quadrangle.com | 2024-08-02 | 104.21.33.13 |
| mx4.quadrangle.com | 2024-07-14 | 104.21.33.13 |
| smtpauth.quadrangle.com | 2024-09-12 | 104.21.33.13 |
| www.mail.quadrangle.com | 2024-12-02 | 172.67.139.163 |
| smtpmail.quadrangle.com | 2024-07-07 | 104.21.33.13 |
| imap.quadrangle.com | 2024-10-29 | 172.67.139.163 |
| pop.quadrangle.com | 2024-07-29 | 104.21.33.13 |
| smtp.quadrangle.com | 2024-12-18 | 104.21.33.13 |
| smtps.quadrangle.com | 2024-09-12 | 104.21.33.13 |
| host.quadrangle.com | 2024-09-12 | 104.21.33.13 |
| out.quadrangle.com | 2025-04-24 | 104.21.32.1 |
| mailgw.quadrangle.com | 2024-09-06 | 172.67.139.163 |
| mx.quadrangle.com | 2024-08-01 | 172.67.139.163 |
| a.mx.quadrangle.com | 2024-09-12 | 104.21.33.13 |
| mbox.quadrangle.com | 2025-02-08 | 104.21.80.1 |