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

Results forwebmail.creativefantasy.jp

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-06-01T07:06:23.038	2021-06-01T00:00:00	2021-08-30T23:59:59	creativefantasy.jp	webmail.creativefantasy.jp	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2021-06-01T07:06:22.651	2021-06-01T00:00:00	2021-08-30T23:59:59	creativefantasy.jp	webmail.creativefantasy.jp	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2021-06-01T06:57:09.207	2021-06-01T00:00:00	2021-08-30T23:59:59	creativefantasy.bpzobucp.mixh.jp	webmail.creativefantasy.jp	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2021-06-01T06:57:08.793	2021-06-01T00:00:00	2021-08-30T23:59:59	creativefantasy.bpzobucp.mixh.jp	webmail.creativefantasy.jp	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"