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

Results for*.densetsu.zone

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-07-08T00:44:03.271	2020-07-08T00:00:00	2021-07-08T12:00:00	sni.cloudflaressl.com	*.densetsu.zone	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2020-07-08T00:44:03.271	2020-07-08T00:00:00	2021-07-08T12:00:00	sni.cloudflaressl.com	*.densetsu.zone	C=US, O="Cloudflare, Inc.", CN=Cloudflare Inc ECC CA-3
2019-12-30T14:12:26.321	2019-12-30T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.densetsu.zone	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-12-30T14:12:26.321	2019-12-30T00:00:00	2020-10-09T12:00:00	sni.cloudflaressl.com	*.densetsu.zone	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-01-30T20:44:39.738	2019-01-30T00:00:00	2020-01-30T12:00:00	sni.cloudflaressl.com	*.densetsu.zone	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2
2019-01-30T20:44:39.738	2019-01-30T00:00:00	2020-01-30T12:00:00	sni.cloudflaressl.com	*.densetsu.zone	C=US, ST=CA, L=San Francisco, O="CloudFlare, Inc.", CN=CloudFlare Inc ECC CA-2