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

Results formatehuala.work

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-06-12T18:09:03.861	2019-06-12T17:09:03	2019-09-10T17:09:03	matehuala.work	matehuala.work	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-06-12T18:09:03.256	2019-06-12T17:09:03	2019-09-10T17:09:03	matehuala.work	matehuala.work	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-25T21:31:32.103	2019-04-25T20:31:31	2019-07-24T20:31:31	matehuala.work	matehuala.work	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-25T21:31:31.393	2019-04-25T20:31:31	2019-07-24T20:31:31	matehuala.work	matehuala.work	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-04T01:59:09.831	2019-04-04T00:59:09	2019-07-03T00:59:09	matehuala.work	matehuala.work	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-04-04T01:59:09.14	2019-04-04T00:59:09	2019-07-03T00:59:09	matehuala.work	matehuala.work	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3