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

Results forwebdisk.okfirewatch.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-09-14T00:49:31.858	2020-09-14T00:00:00	2020-12-13T23:59:59	okfirewatch.com	webdisk.okfirewatch.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-09-14T00:49:31.238	2020-09-14T00:00:00	2020-12-13T23:59:59	okfirewatch.com	webdisk.okfirewatch.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-06-30T18:26:09.923	2020-06-30T00:00:00	2020-09-28T23:59:59	okfirewatch.com	webdisk.okfirewatch.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-06-30T18:26:09.563	2020-06-30T00:00:00	2020-09-28T23:59:59	okfirewatch.com	webdisk.okfirewatch.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"