It can be anything! An apex, subdomain, or even a URL.
Domain Name: www.firebase.commentreply.aiDomain Status: No Object Found>>> Last update of WHOIS database: 2024-09-23T00:27:50.146Z <<<
Domain Name: www.firebase.commentreply.ai
Domain Status: No Object Found
>>> Last update of WHOIS database: 2024-09-23T00:27:50.146Z <<<