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

Results forwebmail.loophereandnow.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-11-24T02:14:41.998	2018-11-24T00:00:00	2019-02-22T23:59:59	loophereandnow.com	webmail.loophereandnow.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-11-24T02:14:27.592	2018-11-24T00:00:00	2019-02-22T23:59:59	loophereandnow.com	webmail.loophereandnow.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-09-09T15:01:04.978	2018-09-09T00:00:00	2018-12-08T23:59:59	loophereandnow.com	webmail.loophereandnow.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-09-09T15:00:44.173	2018-09-09T00:00:00	2018-12-08T23:59:59	loophereandnow.com	webmail.loophereandnow.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"