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

Results forsitemap.moveablefloor.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-06-02T19:58:12.894	2021-06-02T18:58:12	2021-08-31T18:58:12	sitemap.moveablefloor.com	sitemap.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3
2021-06-02T19:58:12.769	2021-06-02T18:58:12	2021-08-31T18:58:12	sitemap.moveablefloor.com	sitemap.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3
2021-03-09T05:42:54.155	2021-03-09T04:42:53	2021-06-07T04:42:53	sitemap.moveablefloor.com	sitemap.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3
2021-03-09T05:42:54.043	2021-03-09T04:42:53	2021-06-07T04:42:53	sitemap.moveablefloor.com	sitemap.moveablefloor.com	C=US, O=Let's Encrypt, CN=R3