It can be anything! An apex, subdomain, or even a URL.

Results for*.kuroutoya.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-01-09T17:22:46.15	2019-11-17T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.kuroutoya.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2020-01-09T17:22:46.15	2019-11-17T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.kuroutoya.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-11-17T14:05:36.525	2019-11-17T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.kuroutoya.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-11-17T14:05:36.525	2019-11-17T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.kuroutoya.com	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2