| Subdomain | First seen | Last seen | DNS | Certificate issuer | Report |
|---|
| 1.39999.biz | Jan 2023 | Mar 2023 | No DNS | Let's Encrypt | Report → |
| www.39999.biz | Jan 2023 | Mar 2023 | No DNS | Let's Encrypt | Report → |
Found in public certificate transparency logs, which record every publicly trusted certificate. Some subdomains may no longer exist.