It can be anything! An apex, subdomain, or even a URL.
Domain Name: www.mail.offshore.aiDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-20T05:56:06.931Z <<<
Domain Name: www.mail.offshore.ai
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-20T05:56:06.931Z <<<