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

Results fortest-2.got.codes

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-03-03T22:05:58.222	2019-03-03T21:05:57	2019-06-01T21:05:57	test-2.got.codes	test-2.got.codes	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-03T22:05:57.312	2019-03-03T21:05:57	2019-06-01T21:05:57	test-2.got.codes	test-2.got.codes	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-24T21:26:20.366	2019-01-24T20:26:19	2019-04-24T20:26:19	*.got.codes	*.got.codes	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-24T21:26:19.433	2019-01-24T20:26:19	2019-04-24T20:26:19	*.got.codes	*.got.codes	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-24T20:52:37.813	2019-01-24T19:52:37	2019-04-24T19:52:37	*.got.codes	*.got.codes	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-24T20:52:37.161	2019-01-24T19:52:37	2019-04-24T19:52:37	*.got.codes	*.got.codes	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3