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

Results forwww.simcli.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-04-15T12:26:39.104	2019-04-15T00:00:00	2020-04-14T12:00:00	simcli.com	www.simcli.com	C=CN, O="TrustAsia Technologies, Inc.", OU=Domain Validated SSL, CN=TrustAsia TLS RSA CA
2019-03-06T09:55:51.044	2019-03-06T08:55:49	2019-06-04T08:55:49	www.simcli.com	www.simcli.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-03-06T09:55:49.663	2019-03-06T08:55:49	2019-06-04T08:55:49	www.simcli.com	www.simcli.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-23T13:13:59.159	2019-01-23T12:13:58	2019-04-23T12:13:58	www.simcli.com	www.simcli.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-23T13:13:58.627	2019-01-23T12:13:58	2019-04-23T12:13:58	www.simcli.com	www.simcli.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-23T08:55:40.467	2019-01-23T07:55:39	2019-04-23T07:55:39	www.simcli.com	www.simcli.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-01-23T08:55:39.592	2019-01-23T07:55:39	2019-04-23T07:55:39	www.simcli.com	www.simcli.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3