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

Results forwww.explorercloudservices.org

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-06-17T09:47:47.892	2021-06-17T08:47:47	2021-09-15T08:47:46	www.explorercloudservices.org	www.explorercloudservices.org	C=US, O=Let's Encrypt, CN=R3
2021-06-17T09:47:47.714	2021-06-17T08:47:47	2021-09-15T08:47:46	www.explorercloudservices.org	www.explorercloudservices.org	C=US, O=Let's Encrypt, CN=R3
2021-06-08T23:36:27.172	2021-06-08T22:36:26	2021-09-06T22:36:26	explorercloudservices.org	www.explorercloudservices.org	C=US, O=Let's Encrypt, CN=R3
2021-06-08T23:36:26.746	2021-06-08T22:36:26	2021-09-06T22:36:26	explorercloudservices.org	www.explorercloudservices.org	C=US, O=Let's Encrypt, CN=R3
2020-06-02T05:08:52.277	2020-06-02T04:08:52	2020-08-31T04:08:52	explorercloudservices.org	www.explorercloudservices.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-06-02T05:08:52.145	2020-06-02T04:08:52	2020-08-31T04:08:52	explorercloudservices.org	www.explorercloudservices.org	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3