| Subdomain | First seen | Last seen | DNS | Certificate issuer | Report |
|---|
| widgets.checkbookpayments.com | Aug 2025 | Jul 2026 | — | Amazon | Report → |
| payments.checkbookpayments.com | Aug 2025 | Aug 2025 | Resolves | Amazon | Report → |
Found in public certificate transparency logs, which record every publicly trusted certificate. Some subdomains may no longer exist.