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

Results forwww.morelli.dev

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-08-15T14:44:59.06	2019-08-15T13:44:58	2019-11-13T13:44:58	www.modniosviceni.cz	www.morelli.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-15T14:44:58.64	2019-08-15T13:44:58	2019-11-13T13:44:58	www.modniosviceni.cz	www.morelli.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-15T12:20:23.712	2019-08-15T11:20:23	2019-11-13T11:20:23	www.morelli.dev	www.morelli.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-15T12:20:23.255	2019-08-15T11:20:23	2019-11-13T11:20:23	www.morelli.dev	www.morelli.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-15T10:12:50.908	2019-08-15T09:12:50	2019-11-13T09:12:50	www.morelli.dev	www.morelli.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-08-15T10:12:50.116	2019-08-15T09:12:50	2019-11-13T09:12:50	www.morelli.dev	www.morelli.dev	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3