| Date | IP Address |
| 2018-08-12 | 40.136.60.66 (ClassC) |
| 2018-11-16 | 23.215.105.91 (ClassC) |
| 2021-01-26 | 23.42.158.209 (ClassC) |
| 2022-01-12 | 104.70.164.35 (ClassC) |
| 2023-02-08 | 23.206.121.208 (ClassC) |
| 2023-12-04 | 23.42.158.8 (ClassC) |
| 2025-06-20 | 23.55.167.10 (ClassC) |
| 2026-01-06 | 23.41.4.6 (ClassC) |
| 2026-02-23 | 23.192.230.145 (ClassC) |
| Date | Domain | IP |
| mi.zyrtec.com | 2025-12-24 | 44.232.179.184 |
| image.newsletters.zyrtec.com | 2025-06-20 | 23.55.167.10 |
| click.newsletters.zyrtec.com | 2024-08-11 | 13.111.90.82 |
| www.zyrtec.com | 2024-11-25 | 23.54.19.186 |