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

Results forroot.md-19.webhostbox.net

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-04-18T04:58:15.048	2019-04-18T00:00:00	2020-04-17T23:59:59	md-19.webhostbox.net	md-19.webhostbox.net	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2019-04-18T04:57:54.968	2019-04-18T00:00:00	2020-04-17T23:59:59	md-19.webhostbox.net	md-19.webhostbox.net	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-05-12T04:29:35.196	2018-05-12T00:00:00	2019-05-12T23:59:59	md-19.webhostbox.net	md-19.webhostbox.net	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"
2018-05-12T04:29:07.245	2018-05-12T00:00:00	2019-05-12T23:59:59	md-19.webhostbox.net	md-19.webhostbox.net	C=US, ST=TX, L=Houston, O="cPanel, Inc.", CN="cPanel, Inc. Certification Authority"