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

Results forwebmail.ecode.dk

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-03-19T02:36:00.44	2020-03-19T00:00:00	2020-06-17T23:59:59	ecode.dk	webmail.ecode.dk	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-03-19T02:35:59.588	2020-03-19T00:00:00	2020-06-17T23:59:59	ecode.dk	webmail.ecode.dk	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-02-22T21:07:19.299	2020-02-22T00:00:00	2020-05-22T23:59:59	ecode.kaso.dk	webmail.ecode.dk	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2020-02-22T21:06:59.294	2020-02-22T00:00:00	2020-05-22T23:59:59	ecode.kaso.dk	webmail.ecode.dk	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-11-27T01:49:27.901	2019-11-27T00:00:00	2020-02-25T23:59:59	ecode.kaso.dk	webmail.ecode.dk	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-11-27T01:49:08.749	2019-11-27T00:00:00	2020-02-25T23:59:59	ecode.kaso.dk	webmail.ecode.dk	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"