| Date | IP Address |
| 2021-04-29 | 199.16.172.36 (ClassC) |
| 2025-11-22 | 216.108.232.100 (ClassC) |
| Date | Domain | IP |
| antispam.clarkbrothersllc.com | 2025-11-22 | 216.108.232.100 |
| authsmtp.clarkbrothersllc.com | 2025-11-22 | 216.108.232.100 |
| relay.clarkbrothersllc.com | 2025-11-22 | 216.108.232.100 |