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

Results forwebdisk.apps.roof7.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-10-28T21:09:36.411	2019-10-28T00:00:00	2020-01-26T23:59:59	apps.roof7.com	webdisk.apps.roof7.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-10-28T21:09:21.606	2019-10-28T00:00:00	2020-01-26T23:59:59	apps.roof7.com	webdisk.apps.roof7.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-08-13T21:09:34.638	2019-08-13T00:00:00	2019-11-11T23:59:59	apps.roof7.com	webdisk.apps.roof7.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-08-13T21:09:20.329	2019-08-13T00:00:00	2019-11-11T23:59:59	apps.roof7.com	webdisk.apps.roof7.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-05-29T19:13:08.3	2019-05-29T00:00:00	2019-08-27T23:59:59	apps.roof7.com	webdisk.apps.roof7.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-05-29T19:12:46.783	2019-05-29T00:00:00	2019-08-27T23:59:59	apps.roof7.com	webdisk.apps.roof7.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"