Found in public certificate transparency logs, which record every publicly trusted certificate. Some subdomains may no longer exist.
| Let's Encrypt |
| Report → |
| link.mail.null.win | Jul 2023 | Jul 2023 | No DNS | Let's Encrypt | Report → |
| www.null.win | Oct 2016 | Jul 2021 | Resolves | Let's Encrypt | Report → |
| media.null.win | Dec 2019 | Apr 2020 | No DNS | Let's Encrypt | Report → |