| Subdomain | First seen | Last seen | DNS | Certificate issuer | Report |
|---|
| seattle.simpleuptime.co | Aug 2026 | Oct 2026 | Resolves | Let's Encrypt | Report → |
| singapore.simpleuptime.co | Aug 2026 | Oct 2026 | Resolves | Let's Encrypt | Report → |
| sydney.simpleuptime.co | Aug 2026 | Oct 2026 | Resolves | Let's Encrypt | Report → |
| us2.simpleuptime.co | Aug 2026 | Aug 2026 |
Found in public certificate transparency logs, which record every publicly trusted certificate. Some subdomains may no longer exist.