It can be anything! An apex, subdomain, or even a URL.
Domain Name: auth.gfx.msDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-20T17:30:46.984Z <<<
Domain Name: auth.gfx.ms
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-20T17:30:46.984Z <<<