| Subdomain | First seen | Last seen | DNS | Certificate issuer | Report |
|---|
| mail.symbolinc.io | Mar 2025 | Mar 2025 | No DNS | Let's Encrypt | Report → |
| ssh.symbolinc.io | Mar 2025 | Mar 2025 | No DNS | Let's Encrypt | Report → |
| www.autoconfig.symbolinc.io | Feb 2025 | Feb 2025 | No DNS | Let's Encrypt | Report → |
| autoconfig.symbolinc.io | Feb 2025 | Feb 2025 | |
Found in public certificate transparency logs, which record every publicly trusted certificate. Some subdomains may no longer exist.