It can be anything! An apex, subdomain, or even a URL.
Domain Name: test.spo.msDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-20T15:28:11.525Z <<<
Domain Name: test.spo.ms
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-20T15:28:11.525Z <<<