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

Results forwebmail.corp.validns.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2022-09-03T09:23:58.25	2022-09-03T00:00:00	2022-12-02T23:59:59	corp.validns.com	webmail.corp.validns.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2022-09-03T09:23:57.635	2022-09-03T00:00:00	2022-12-02T23:59:59	corp.validns.com	webmail.corp.validns.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2022-06-29T09:23:45.216	2022-06-29T00:00:00	2022-09-27T23:59:59	corp.validns.com	webmail.corp.validns.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2022-06-29T09:23:44.404	2022-06-29T00:00:00	2022-09-27T23:59:59	corp.validns.com	webmail.corp.validns.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2022-04-24T09:24:07.625	2022-04-24T00:00:00	2022-07-23T23:59:59	corp.validns.com	webmail.corp.validns.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2022-04-24T09:24:06.362	2022-04-24T00:00:00	2022-07-23T23:59:59	corp.validns.com	webmail.corp.validns.com	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"