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

Results forwww.httpsb.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-10-04T10:21:56.76	2020-10-04T09:21:56	2021-01-02T09:21:56	www.httpsb.com	www.httpsb.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-10-04T10:21:56.597	2020-10-04T09:21:56	2021-01-02T09:21:56	www.httpsb.com	www.httpsb.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-23T00:10:44.634	2019-12-22T23:10:44	2020-03-21T23:10:44	httpsb.com	www.httpsb.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-12-23T00:10:44.506	2019-12-22T23:10:44	2020-03-21T23:10:44	httpsb.com	www.httpsb.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-10-23T01:19:46.045	2019-10-23T00:19:45	2020-01-21T00:19:45	httpsb.com	www.httpsb.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-10-23T01:19:45.877	2019-10-23T00:19:45	2020-01-21T00:19:45	httpsb.com	www.httpsb.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3