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

Results forwebdisk.targetier.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-04-05T22:41:51.453	2018-04-01T00:00:00	2018-06-30T23:59:59	targetier.com	webdisk.targetier.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-04-05T22:41:51.44	2018-04-03T00:00:00	2018-07-02T23:59:59	targetier.com	webdisk.targetier.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-04-03T09:33:58.149	2018-04-03T00:00:00	2018-07-02T23:59:59	targetier.com	webdisk.targetier.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-04-01T09:33:02.587	2018-04-01T00:00:00	2018-06-30T23:59:59	targetier.com	webdisk.targetier.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"