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

Results forprofiles.cooper.app

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-10-27T17:45:01.5	2019-10-27T16:45:01	2020-01-25T16:45:01	www.goldzempire.com	profiles.cooper.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-10-27T17:45:01.315	2019-10-27T16:45:01	2020-01-25T16:45:01	www.goldzempire.com	profiles.cooper.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-30T12:13:55.23	2019-08-30T11:13:54	2019-11-28T11:13:54	iballwasrawt.ru	profiles.cooper.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-30T12:13:54.45	2019-08-30T11:13:54	2019-11-28T11:13:54	iballwasrawt.ru	profiles.cooper.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-30T10:10:15.675	2019-08-30T09:10:14	2019-11-28T09:10:14	profiles.cooper.app	profiles.cooper.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-30T10:10:14.875	2019-08-30T09:10:14	2019-11-28T09:10:14	profiles.cooper.app	profiles.cooper.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3