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

Results forwebdisk.greenyservices.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-09-04T17:08:01.333	2020-09-04T00:00:00	2020-12-03T23:59:59	greenyservices.com	webdisk.greenyservices.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-09-04T17:08:00.931	2020-09-04T00:00:00	2020-12-03T23:59:59	greenyservices.com	webdisk.greenyservices.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-06-20T12:47:18.37	2020-06-20T00:00:00	2020-09-18T23:59:59	greenyservices.com	webdisk.greenyservices.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-06-20T12:47:18.065	2020-06-20T00:00:00	2020-09-18T23:59:59	greenyservices.com	webdisk.greenyservices.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"