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

Results forsitemaps.moveablefloor.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-06-02T20:32:23.001	2021-06-02T19:32:22	2021-08-31T19:32:22	sitemaps.moveablefloor.com	sitemaps.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3
2021-06-02T20:32:22.791	2021-06-02T19:32:22	2021-08-31T19:32:22	sitemaps.moveablefloor.com	sitemaps.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3
2021-03-09T06:04:48.942	2021-03-09T05:04:48	2021-06-07T05:04:48	sitemaps.moveablefloor.com	sitemaps.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3
2021-03-09T06:04:48.755	2021-03-09T05:04:48	2021-06-07T05:04:48	sitemaps.moveablefloor.com	sitemaps.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3