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

Results forcigarstack.app

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2018-08-09T10:14:39.325	2018-08-09T09:14:38	2018-11-07T09:14:38	cigarstack.app	cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-09T10:14:38.688	2018-08-09T09:14:38	2018-11-07T09:14:38	cigarstack.app	cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-09T06:17:28.313	2018-08-09T05:17:27	2018-11-07T05:17:27	cigarstack.app	cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-09T06:17:27.929	2018-08-09T05:17:27	2018-11-07T05:17:27	cigarstack.app	cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-09T00:50:34.714	2018-08-08T23:50:34	2018-11-06T23:50:34	www.cigarstack.app	www.cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-09T00:50:34.521	2018-08-08T23:50:34	2018-11-06T23:50:34	www.cigarstack.app	www.cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-08T18:18:06.866	2018-08-08T17:18:06	2018-11-06T17:18:06	www.cigarstack.app	www.cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2018-08-08T18:18:06.647	2018-08-08T17:18:06	2018-11-06T17:18:06	www.cigarstack.app	www.cigarstack.app	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3