It can be anything! An apex, subdomain, or even a URL.
Domain Name: d.nic.soDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-20T19:35:35.846Z <<<
Domain Name: d.nic.so
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-20T19:35:35.846Z <<<