It can be anything! An apex, subdomain, or even a URL.
Domain Name: www.demo.strings.aiDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-21T10:38:02.545Z <<<
Domain Name: www.demo.strings.ai
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-21T10:38:02.545Z <<<