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

Results forwww.hellooffice.org

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-12-25T11:39:31.736	2020-12-25T10:39:31	2021-03-25T10:39:31	www.hellooffice.org	www.hellooffice.org	C=US, O=Let's Encrypt, CN=R3
2020-12-25T11:39:31.495	2020-12-25T10:39:31	2021-03-25T10:39:31	www.hellooffice.org	www.hellooffice.org	C=US, O=Let's Encrypt, CN=R3
2019-12-10T22:05:00.007	2019-12-10T21:04:59	2020-03-09T21:04:59	www.ubsi.org	www.hellooffice.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-10T22:04:59.744	2019-12-10T21:04:59	2020-03-09T21:04:59	www.ubsi.org	www.hellooffice.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-10T22:04:55.921	2019-12-10T21:04:55	2020-03-09T21:04:55	ubsi.org	www.hellooffice.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-10T22:04:55.713	2019-12-10T21:04:55	2020-03-09T21:04:55	ubsi.org	www.hellooffice.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3