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

Results forwebmail.cornerperk.hdwebdev.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-02-27T01:29:32.938	2020-02-27T00:00:00	2020-05-27T23:59:59	cornerperk.hdwebdev.com	webmail.cornerperk.hdwebdev.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-02-27T01:29:14.477	2020-02-27T00:00:00	2020-05-27T23:59:59	cornerperk.hdwebdev.com	webmail.cornerperk.hdwebdev.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-12-25T00:27:40.354	2019-12-25T00:00:00	2020-03-24T23:59:59	cornerperk.hdwebdev.com	webmail.cornerperk.hdwebdev.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-12-25T00:27:26.677	2019-12-25T00:00:00	2020-03-24T23:59:59	cornerperk.hdwebdev.com	webmail.cornerperk.hdwebdev.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-10-10T05:25:26.28	2019-10-10T00:00:00	2020-01-08T23:59:59	cornerperk.hdwebdev.com	webmail.cornerperk.hdwebdev.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-10-10T05:25:07.439	2019-10-10T00:00:00	2020-01-08T23:59:59	cornerperk.hdwebdev.com	webmail.cornerperk.hdwebdev.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"